HI Cactusdiver,
There are no bad months to go to Bonaire. Around the full moon in Sept is the coral spawn....that's a good or bad thing depending on your point of view. It's neet to watch the coral spawn but it also degrades the vis some.
As for the resorts on Bonaire, what are you looking for? A 5 star place or a good clean dive resort? Prob the most upscale place on Bonaire is the Plaza, a nice place from what I hear but I have never stayed there. If you are looking for a nice place but not the fancyest then there are lots of places. Capt Dons, Lions Dive, Sand Dollar, Buddy DIve (my choice) and Divi to name only a few. IMHO do NOT get any all inclusive deals, by AI I mean all meals included. There are loads of good places to eat on Bonaire and while most of the resorts have good restaurnats, if you get an AI you to miss a lot of other great places to eat. We get the "Drive and Dive" package at Buddy. It is kind of an AI in that it includes a condo, rental truck, breakfast, airport xfer, 6 boat dives and unlimited tanks for shore diving. You will want all of these things when on Bonaire so I just perfer to get them at one place. The included breakfast is the only exception I have to not wanting any meals included. It's kind of hard to mess up breakfast and BD has a great buffet breakfast so we do include it. We also drop the 6 boat dives. It knocks off $100pp from the package cost and we much prefer to shore dive. You can always add boat dives back if you choose. If you are wanting an AI because of drinking water safety (and food ), don't worry about that. Bonaire uses only distilled water on the entire island and the drinking water is completely safe to drink...and taste great as well.
The "drive thru" air station is to the best of my knowledge only at Buddy Dive. In any case, the general mode on Bonaire is to pickup tanks from your dive shop and head off to any of about 80 marked dive sites, pull off the road and dive. The dives start at about 10 ft, slope off to about 35ft over a 150-200 ft run then drops sharply to about 100ft.
I think Natasha from the board is hosting a trip to Bonaire in Sept, if you want to join a group, she host a great trip. I can highly recommend her. In addition, I am heading down in July with a group of 8 or 10. If you would like to hang out with some experienced Bonaire Divers you can meet us there.
Here is the address of a Bonaire board similar to this one, drop by over there ask some questions as well.
www.bonairetalk.com
You might also want to do a search on this board and the BT board, there has been a lot of good info posted on both boards over the years.
PM me if you like.