We just got back from Bonaire. We dove north, we dove south, we left our truck parked in town, never had any problems. Never locked the doors, never left anything expensive in it. When we were diving, the truck contained a solar shower in the bed, our flip flops, hat, cheap sunglasses, BSDME, another bonaire guide book, and our dive log. Never even had any evidence that anyone went through our stuff much less took anything. I was pretty concerned about this before I went but not so worried now. We did see a carload of local teenagers driving up and down the road on the northern dive sites, quite sure they were looking for trouble. But they didn't bother our (useless) stuff in the truck.
I did put travel alarms on every door in our hotel at night though. I'm kinda paranoid about people breaking into the room while I'm sleeping after reading some reports of that happening to people on Bonaire a while back. Didn't happen to us.
The restaurants were mostly great. We ate at Patagonia, Richard's, ZeeZicht, Jibe city snack bar, Maiky Snack, and Nadia Snack. The first three were EXCELLENT in all respects. The pier table at Richard's just can't be beat for a romantic dinner on Bonaire. ZeeZicht had the best steak I've had in a while but they are heavy on the sauces (not a negative, just a warning for some, I liked it). Jibe city was not so great, dutch hamburgers are just plain weird... they put some kind of filler in with the meat that tastes really strange. Maiky Snack had fantastic goat stew but chew carefully, lots of bone fragments in there, and I tried the funchi but found I don't really care for it. Plus at Maiky you get to see next month's menu (the cute baby goats). Nadia Snack was just ok, but seemed popular with the locals. I had Conch Fried Rice which was so-so, but my wife had a chicken and vegetable dish that was pretty tasty. We were the only tourists in there for lunch. The lady behind the counter (I assume the owner) barely spoke english but was friendly.
Most expensive meal was Richard's, but we ate a lot more than usual there, appetizers, dessert, everything, had plenty of drinks and it still only came to just over $100. With the quality of the food and service, it was well worth it, IMO. And my wife just absolutely loved it. She said it was the most romantic dinner she'd ever had. To get a reaction like that I'd have spent twice as much.
Enjoy your trip!