Hi there!
I just returned from a research trip in Bonaire--didn't get to do as much diving as I would have liked, but I got to explore the topside of the island a little. If you go to Bonaire, be sure to go to Sand Dollar Condominiums and sign up for the cave snorkel tour with "Hank the caveman." Best $40 I ever spent! He takes you into amazing pristine caves--a word of caution--these caves get INSANELY hot, so be sure to drink lots of water beforehand! Sand Dollar also has a kayak trip through the mangroves that is supposed to be nice. If you are into interesting sights, geology, or blowholes, be sure to visit the Washington National park ($10 per person). It takes a while to drive through, and they want you OUT by 5:00, so plan to go early in the day--oh, the road through the park can get pretty choppy, so make sure you rent a 4-wheel drive Jimny or something similar. If you have more time out of the water, there is a road that goes around the salt mine--pretty cool operation to see! The same road takes you around a marshy area where we saw oodles of flamingos! And be sure to peek in the Slave Huts near the salt mine--you won't believe that 8 people used to sleep in there!
As far as restaurants go, there are a good number of them in Kralendijk--mexican, italian, french--pretty surprising! We liked one called The City Cafe, or something like that--it had bright tables and chairs. They had an Argentinian Grill special for two people--a hibachi FULL of grilled stuff brought to your table for $29.00! They also had a bunch of inrteresting vegetarian dishes. "The Lost Penguin" is good for lunch--the fruit salad is a great deal, and hits the spot on a hot day--don't go if you're in a hurry though--dining takes a little longer on Bonaire.
If you (or anybody else) would like any info, please feel free to send me a private email, I have been to Cayman Brac and Grand Cayman as well (we stayed on Brac and took a boat to Bloody Bay in Little Cayman for US$60). I would be happy to answer any questions that I can! I'm putting some pictures on the web--I'll have that site up soon so you can get a glimpse of things that aren't in travel guides (and you can snicker at unbecoming shots of my boyfriend and I--tee hee!).