I just returned from Bonaire this evening... I am tired from diving, but I can give you couple of short answers with questions backing it... and answer after sleep has done its best on me...
What type of diver are you? What type of divers are in your group?
These two questions can answer your $500 question (The next question is "How are you deriving your $500 difference?" Did you call Buddy Dive [or a booking agency like Caradonna] to get the best deal you could get?)
Enough of my questions...
Our first trip to Bonaire was with Buddy Dive through Caradonna. We had the corner balcony room overlooking the docks and the dive center... Awesome view!
We never saw the resort or the pool or the grounds. We are considered "hard core" divers. Up early in the morning and in the water off the house reef at whatever depth and in whatever direction... After that dive, it is time for buffet breakfast included in our resort dive package (with free nitrox upgrade [offered by all dive centers]) and then to the drive through for our tanks... and, off to our day of diving...
Sometimes lunch at the beach bar for burgers and fries, then back out for more diving...
Dinner was usually somewhere out on the town, or in our condo (If you can cook on gas, it saves some money to eat some meals in the room). After that, a twilight and/or night dive on the house reef, or another location around the island...
We rack up 25+ dives per week... some easily done from the house reef and others done around the island (If you have photographers in the group like we do, any reef will give you infinite photo ops!)
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This trip we stayed at the Plaza. The Plaza is a bit more resort than Buddy Dive. Think of Buddy Dive as a dive resort and the Plaza as a resort with diving (There is a lot more walking at the Plaza to get from place to place, they don't have a drive through tank location and they only have four whips to fill nitrox... get your tanks as soon as you can!)
With the above stated... Please understand... Caribbean Dive Resorts cannot be compared to resorts in the US or other locations. Caribbean Dive Resorts are in their own class and should be thought of in the respect of: Is the room clean, big enough to hold all your gear, enough outlets to recharge batteries, is there air conditioning that works, can you make ice, do they mop each day, and can you toss yesterday's laundry in the corner until the trip is done? If the answer to all these questions is "yes", then it is a four-star dive resort in the Caribbean
We got a deal for our large group that gave us two bedroom villas (sleeps 4) with dive package (nitrox), vehicle rental (full insurance), Buffet breakfast and Tuesday night BBQ for less than $700 US per person per week (transfers to and from the airport - across the street from the Plaza). The original package included boat dives, but we all opted out of their boat package and the price was reduced.
The house reef is 18th Palms. This is a fantastic double reef system that gave me (photographer) some fantastic shots. Bottom was 107' and the second reef rose to approx 75'. I have shots of seahorses, snake eels in an orgy, octos, chairn morays and a host of creatures I have never seen while diving... seven different moray eels and we still have to id two of them. Every day and night included a seahorse on the house reef.
At MIA airport, we hooked up with a dive master for Wanna Dive who was returning to Bonaire. He was a fantastic source of information and invited us to the Wanna Dive Hut BBQ parties on Thursday nights ($10 all you can eat!) Wanna Dive has several drive through locations on the island, but does not have a resort on the water. We toured their rooms and... as a hard core diver, I might like to get a dive package from them the next time and skip the resort
Enough for now... very tired...