These are ranked in the order I liked them in, based on food and ambiance. B’s ratings would be different, I’m sure.

1. Moorea Beach [Otres 1]: We got comped drinks here after our island tour, because the outing was supposed to include breakfast, but didn’t. After that, B ordered the mixed salad, which was made of calamari, shrimp, octopi, carrot, pineapple, and a delicious sauce. It was one of the best dishes we had on this beach!
2. The Lighthouse [Otres 1]: Several of the beaches here have a night-time BBQ on the beach: they grill fish, chicken, beef, pork, and veggies – which you can order off a menu or pick out of a glass case. We really enjoyed this BBQ. All of the meats were delicious, as were the garlic bread, vinaigry salad, and potatoes that came with them. B also tried their kebabs, which were good. And best of all, the staff was very friendly, remembering us and smiling every time we saw them. I don’t know what the TripAdvisor review people are talking about; this is a great place!
3. Sunshine Café [Otres 1]: Next door to our guesthouse, this place was a favorite of mine. They say they’re well-known for their large portion sizes, but I just like their cook. I had fresh chicken and vegetarian spring rolls here so many times that I should know how to make them by now. I also liked their mango pancake, which was a giant flapjack with mango baked into it. Their mixed vegetable salad is also decent.
4. Nyam [Town]: This place came recommended by multiple blogs, and their approach is ‘to make Khmer food accessible to Westerners.’ To me, this means Western prices in exchange for very clear descriptions in English. It’s done tapas-style, so we split fish cakes and beef with onions; B had pork meatballs and a too-spicy-for-me chicken dish; and I had mango/cashew chicken. For all my cynicism above, it all tasted good.
5. Sea Garden [Otres 1]: This was our guesthouse, so we ate here all the time. Their yogurt with fruit has more yogurt than is usually served in Cambodia (a plus), and their porridge is American hot oatmeal, not the Khmer variety (a minus). The pancakes are crepes, but when it says mango inside, imagine two slices of mango just thrown inside the crepe. (It’s served with honey, so I just ate the mango and made it a honey crepe.) The noodle soup was good; it has yellow egg noodles rather than the ramen noodles we’ve seen elsewhere. The coconut chicken curry was a bit heavy on the oil for my taste, but B helped me out. He liked their vinegary salad too.
6. Papa Pippo [Otres 1]: This restaurant is well-known for serving Italian food. Funny that we complained about it in Italy, and now we’re eating in Cambodia on purpose. B liked their pork scaloppini, and we both thought the various types of fresh pasta were decent. B said their piadas tasted like a sandwich with thin-crust pizza for bread. The pizza was decent too, though I didn’t think it was earth-shattering, like some reviewers claimed. This is also one of only a few places here that serves non-fruit dessert: they have homemade gelato, muffins, cookies, brownies, and cheesecake. The brownie tasted like food-colored sugar to me, but the cheesecake was good. And their wifi is the strongest on this beach.
7. Street Stand [Otres 1]: This is the roadside stand next to Vanny’s Restaurant, and it always seems to have customers. B liked their noodle soup a lot. My fruit salad was good, though the yogurt on top was either not yogurt or was freezer-burned or both; I just ate around it. I also enjoyed their sweet and sour chicken, and B was happy enough with their fried noodles with pork. The pineapple shake is a better better – and less sweet – than the pineapple juice, if you’re picking between the two.
8. Bamboo Shack [Otres 1]: This restaurant is the first one we visited. As soon as we went inside, I noticed that they have a second version of their restaurant sign that reads, ‘Bamboo Sack’; oops! Their food was perfectly average: a fish and cashew fried rice for B and fried chicken and mushrooms for me. We would return.
9. Mushroom Point [Otres 1]: This place has cute mushroom-like decorations, and no wifi in the cafe, a rarity at beach-side places. Their BBQ is different from the others’: my BBQ chicken was just chicken fried in oil, and B’s BBQ salad was an eggplant, zucchini, etc. salad. However, his BBQ barracuda had a nice sauce on it, and the Balkan BBQ Lepinja was minced beef and pork in a pita-like shell. Their mango pudding was fairly bland, but it would have been better if I had eaten it with the fresh mango and passionfruit pieces on top, rather than separately. Overall,  I wasn’t a huge fan, but B liked it. And the staff was very nice: the local guy even memorized B’s (unusually-for-Cambodia) name after our first visit!
10. Secret Garden [Otres 2]: I had considered staying here before I learned that it was $150 per night, and my research suggested that their food was good. It is certainly Western, with the accompanying prices and presentation. B’s fish and chips plate was good, and he enjoyed their happy hour cocktails. My bruschetta, on the other hand, was on untoasted, non-garlicky soft bread. And the price of their prix fixe dinner of the night (which we did not have) was the same as our combined food budget over the past two days. Service was good though, and the cocktails may be worth it for some.
11. Nax’s Shack [Koh Ta Kiev Island]: This stop was just because our tour didn’t include the promised breakfast, so we were too famished to wait another hour before eating. We split an English breakfast: I had some baguette and tea, and B had eggs, bacon, and a processed-looking sausage. Passable.
12. Shin [Otres 1]: Maybe we didn’t get the best impression of this ‘sushi’ place because we came half an hour before closing. However, their sushi menu is small, and by that time of night, it was even smaller. We managed to get tuna nigiri, tuna rolls, avocado rolls, and salmon rolls to share; I don’t believe anything else was available. The defining characteristic of this sushi was that it included a brain-emptying amount of wasabi. I almost always add wasabi to my sushi, and this time, I opened up the rolls and scooped out the green stuff so it wouldn’t destroy my entire limbic system. B said, ‘Do you think the chef knows what wasabi tastes like?’ Spiciness aside, the fish seemed relatively fresh, and my mango drink was fine. If you wander in, don’t be discouraged by the emptiness of the place: it’s more popular as the beach’s late-night bar hangout, but they do serve food.