Well, my first suggestion is check out
www.shorediving.com
in addition to things you've already looked at.
We had two adult gentlemen who REALLY liked the free champagne on Air Jamaica, who both wore the headphones for free music, who had to shout to each other while arguing good-naturedly, especially about how the music they were listening to was better than what the other gentleman was listening to. The flight attendants had to treat them like misbehaving little children, and none of the rest of us on the flight could keep straight faces - including the flight attendants when they were around our row, three rows behind these gentlemen.
The day we drove through the big park up north, we had my non-diving in-laws with us, whose main thing was wanting to see flamingos, so we didn't have tanks & gear with us. I regretted that after we stopped for them to take photos at Boca Slaagbai - we'll definitely dive there if / when we return to Bonaire.
The KFC downtown has to win my award for biggest demonstration of oxymoron for 'fast food'. I ordered, received, and ate my delicious pizza from the stall across from KFC while my wife was still waiting to get to the front of the line at KFC - it was a 'shopping day' afternoon with the in-laws.
My favorite restaraunt there was 'It Rains Fishes' - the Shrimp Newburg was fantastic.
Between the Bonaire talk site, the shore diving site, and this board, you should have just about all the resources you could need for before you arrive, and your hosts at DBV can undoubtably provide others after you arrive.
We stayed at Bellafonte Chateau de la Mer, for similar reasons that you chose DBV, and DBV was our runner-up, so I think you should be in good hands. The Bellafonte had a good arrangement where we rented a 2 bedroom and got a break on the rate for the days just my wife & I were there vs. the days her parents joined us. Take a look at that property while you're puttering about as something to consider for a return trip - my posts on the shore diving site regarding it are under the 'North Belnem' site listing.
If you've already got a truck reserved, you might check for gasoline vs. diesel powered. Diesel was way lower price (about 1/3) than gasoline when we visited last year, and we took the Musso 4WD truck from AB Car Rental with full insurance package special, and always locked it (knowing the 'full insurance' would cover most anything) - and the savings using diesel paid for the differential vs. a lower priced gasoline engine truck.
http://www.abcarrental.com/travelguide/
Have a great trip!