Resorts in Belize tend to have a few things in common. There's an environmental sustainability focus that seems particularly strong among Belizean resorts. There's also a focus on going and doing activities when visitors come to Belize. You can certainly lie on a beach sipping daiquiris if you want, but most resorts here tend to position their all-inclusive packages less as an indulgence, and more as a convenience—they seem to implicitly say, "Here's one less thing you have to worry about between fishing trips or hikes."
El Pescador is all about fishing and diving—though you probably guessed that from the name. Based on what you're after, they offer a variety of all-inclusive packages. The default gets you three meals a day, hors d'oeuvres in the bar, all the local beverages you care to drink (including beer and rum), plus access to the pools, Wi-Fi, gym, kayaks, bikes, and more. They offer separate packages for those who have come out specifically for fishing and diving. Being a smaller, family-run operation, there's only one restaurant, offering two entrées and a buffet nightly during dinner. Despite its size, you'll definitely feel taken care of—El Pescador was one of Forbes Travel Guide's top ten luxury eco-resorts.
Hamanasi Adventure and Dive Resort
Hamanasi's accommodations include beachfront suites and stunning treehouses. Their all-inclusive package includes three meals a day, transportation, kayaks, and park entrance fees. They'll also pack you a lunch on days when you're off on tours. It's these tours that really set Hamanasi apart. A four-night stay at Hamanasi includes three tours—two snorkeling trips at the barrier reef and one island tour—and the tours scale up the longer you stay. You can zip-line over the Belizean rainforest, cave tube down the rivers, explore the Mayan Ruins of Xunantunich, and much more. Of course, just because you won't spend a ton of time at the resort itself doesn't mean it's not grade-A. They proudly bear five TripAdvisor Travellers' Choice awards for 2016.
St. George's Caye Resort
St. George's Caye focuses on diving. Their all-inclusive packages include three meals (including a four-course dinner), kayaks, windsurfers, catamarans, snorkel gear, pool access, and one rum punch every day. They don't do they "unlimited drinks" thing, but, again, the focus here is one adventure-having. If you're not a diver, they also have packages that include things like cave tubing, jungle zip lines, trips to the Mayan ruins, and other excursions.
As is the norm for Belize, Belizean Dreams promises "relaxation and adventure." Their "Just Chillin'" package includes three meals and a bar snack daily (including lunch on tours), plus unlimited local beer, soda, and mixed drinks. You also get free rein of the kayaks, bikes, snorkeling gear, and the infinity pool. The "Mayan Jungle & Beach Vista" package ranges from 1 to 4 tours, depending on how long you stay, and rotates throughout weekdays from waterfall hikes to island hopping. There does seem to be a four-night minimum for the packages, so bear that in mind before booking.