Well, I suppose there are some 'signature dive sites.'
1.) Oil Slick Leap is a good site, and the giant stride in (around 8 foot drop) rather fun. Definitely on the list.
2.) 1,000 Steps actually has 60 something steps, or thereabouts, and the stairwell is quaint and looks good in photos. Just the name evokes an impressive atmosphere. Good to do.
3.) The Cliff is the only Bonaire site I know that actually looks like 'wall diving,' which is a bit different.
4.) The Hilma Hooker is not the only wreck, but it's the big one with the greatest name recognition and the reef's nice, too. Another good choice, but entry can be a bit difficult as there's kind of a step off entering the water.
5.) Windsock has one of the easiest entries around. A friend & I chose it for a night dive, as we figured getting out in the dark would be easier near some shore structure at one end of the site. And that worked out alright.
6.) A number of people really like Karpata.
7.) Off Eden Beach's 'Eden's Rubble' is the wreck of the Bakanal; far smaller than the Hilma Hooker, but you can actually take a photo of the whole thing. Not much reef here.
There are other fun places to dive on Bonaire, but if it's new to you, these are some good places to put on your list. I know Angel City & Alice in Wonderland are also popular. I like Tolo (Ol'Blue).
Richard.