Just got back from Bonaire on Sunday June 28. Was our first trip to Bonaire as well. My thoughts......
We rented a pickup truck from Budget. It was a stick shift. Luckily my wife and I grew up with stick shift vehicles so just be aware.
With two teen age boys and a 9 year old in tow, we ate most meals in. Grocery store we frequented is Van den Tweel. It's very much an American type grocery store. Would say 80% of the products are Dutch and imported from Holland and 20% are the international version of US products. Bring a quarter to unlock the shopping cart which you get back when you return the cart. Bring your own grocery bags or buy a bag(s) for I think 50 cents. If you have any specific food issues, requirements, or restrictions it would be helpful to learn the Dutch word for it as most labels are in Dutch. Beer, wine and some liquor is sold in the grocery store. Cans/bottles of beer are sold individually.
Do drive the road around the southern end of the island to see the salt flats and over to the east side and up to Lac Bay. Can go windsurfing at Lac Bay. Rentals and lessons are available.
Visit Washington Slagbaai National Park. We were not too thrilled with the snorkeling there but next time will bring tanks and hit some of the dive sites there. Bring water and lunch and make a day of it. Bring the receipt which you get when you buy your marine park tag which will get you into the park. Also they will ask to see an ID along with the receipt. It takes 1.5 to 2.5 hours just to drive thru the park. Driving thru the park reminded me at times of driving thru Saguaro National Park with the cactus and desert scenery.
Gio's in Kralendijk has excellent ice cream.
Dive Friends Bronare is a very good operation. They have a new retail store with a good selection of equipment if you need anything while you are there. I ended up needing a new mask which I bought there and they even cleaned the lens with toothpaste for me.
West side diving is great and relatively easy though some entries/exits can be more difficult due to iron shore and surf. I would highly recommend hard soled booties due to the iron shore and coral rubble you need to walk on at the dive sites. We used
these booties and they worked very well. Leaving extra tanks in the truck is fine and will not be bothered with but make sure you can live without anything else you leave in the truck. Bought cheap $10 sunglasses at Walmart and kept them in BC pocket and didn't care if they got scratched. After we went thru security at the airport in the States we each bought a sport squeeze bottle of water which we refilled (tap water tastes excellent...as in no taste) and used all week and brought to the dive sites with us. I also used this little
case to put some cash, credit card, drivers license and truck key in when we dove. Small and fit right in BC pocket.
Hope this helps.