Here's my boilerplate comparisons of the two islands:
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AMBERGRIS CAYE (often referred to as San Pedro):
* The biggest island in Belize (originally a peninsula jutting down from the Yucatan) - northern Belize
* Settled by Mestizos from Mexico
* Most popular destination in Belize (for many good reasons)
* Tends to attract a crowd in their 30s, 40s and older, mostly couples
* Some 20,000 people on the island
* #1 area in Belize for foreign investment and expat living - second homes, condos, retirement
* Sand streets though some of the streets are now paved with concrete cobblestones; formerly no building over three stories, but some new developments have four stories
• Significant new development has place south of town and also on North Ambergris
* By far Belize's widest selection of restaurants and hotels
* Among the best top-end hotels and condotels: Victoria House, Azul Resort, Pelican Reef and Mata Chica
* Among the best condotels: Grand Caribe, Grand Colony, The Palms, Xanadu, The Phoenix, Coco Beach, Las Terrazas
* Among the best mid-range lodging: Mayan Princess, Corona del Mar, Banana Beach, The Tides
* Among the best budget lodging: Ruby's, Sanpedrano, Pedro's Inn
* Some shops, sizeable groceries, lots of bars and places to hear live music
* Some excellent restaurants including:
Very Expensive: Rojo Lounge, Capricorn, Red Ginger
Expensive: Blue Water Grill, Rendezvous, Elvi's, Pinocchio's, Hidden Treasure, Sunset Grill, Wild Mangos
Moderate: Caramba
* Very nice beaches though like all beaches inside the reef somewhat narrow and with some goop bottoms and a good deal of seagrass - garbage on the beach in areas not policed by hotels
* Beaches along most of the Caribbean side
* Reef just a few hundred yards offshore, closest at the far north
* Your first decision is to decide where to stay - in town, south of town, on North Ambergris near the river channel or on more remote parts of North Ambergris
* Lots of snorkel tours and day trips to the mainland to visit ruins
* Good recreational diving locally and excellent diving on day trips to Turneffe or Lighthouse atolls
* Get there by 20-minute flights from international or municipal airstrip or by 75-minute water taxi
* Friendly and safe though usual cautions are in order - burglaries and thefts are fairly common, murders not unknown
* Transportation on the island - bikes, rental golf carts, cabs, water taxis
* Traffic in town is starting to get really bad
* New bridge over Boca del Rio (mostly carts, bikes and pedestrians) is helping open up North Ambergris, but cart path there is very rough in places
* Hotels from US$15 to $500+ a night
* Small condos and vacation rental houses available US$100 to $500+ a night
* No golf on island
* Tennis available at sports club and at several hotels
* Water - safe to drink from municipal system or RO/wells
* Good fishing - tarpon, bonefish and other
* Little snorkeling from shore -- best snorkeling requires a short boat ride to Hol Chan Marine Reserve including Shark-Ray Alley
* About the same amount of rain as Atlanta, Ga.
CAYE CAULKER:
* Still a charming, laidback small village atmosphere with a Caribbean resort vibe
* The main part of the island really is just one village of about 1,400 people, and on the average day maybe 300 or 400 tourists
* The vibes are laidback, easy-going, calm
* This is Ambergris Caye's little sister -- smaller and a cheaper date
* Moving more upmarket, with several condos recently opened, but it is still mostly a moderate, budget and backpacker island -- only five hotels on the island have a pool, for example
* Sand streets, few cars, you get around by shank's mare, bike or maybe a golf cart
* A mix of people on the island, Mestizos, some Creoles, some gringos
* About 55 hotels and vacation rentals, mostly very small, with a total of around 900 rooms
* Beaches are not the island's strong point -- a little swimming from piers and one or two places south, but the Split is the main area where folks swim
* New municipal RO water system
* Best hotel on the island costs only about US$200 a night
* Iguana Reef Inn, Seaside Cabanas and CayeReef Condos are among the most "upscale" choices for Caulker, and all have pools
* Other good low-moderate choices -- Tree Tops, Trends Beachfront, Shirley's, Anchorage, Jaguar Morning Star, Lazy Iguana B&B, Caye Caulker Condos, De Real Macaw, Barefoot Beach, Maxhapan and others
* Good restaurants at the top end include Habaneros, and good food, too, at Rosa's, Rainbow Grill, Sand Box, Wish-Willie's, Amor y Café, Femi's, Jolly Roger and others
* Two or three dive shops do dive trips -- snorkeling and diving here are a little cheaper than San Pedro and Placencia
• The reef is just a few hundred yards offshore
* For booze and what action there is, hit the Lazy Lizard, Ocean Front, I&I and a few other bars
* Rastas occasionally bug you
* No golf or tennis
* Safe, but several high-profile crimes occurred recently on island
* Getting there is easy -- it's a 45 water taxi ride from Belize City and less from San Pedro; or a few minutes by air on Maya Island or Tropic Air