I have to agree that if you're looking to go somewhere quiet (no hussle and bustle), very relaxing, with great (easy) diving, good food choices, beautiful scenery, and where you can dictate when you're doing to diving, etc., Bonaire is an excellent choice.
We found it to be extremely romantic, especially when we were sitting by the water enjoying dinner and a drink, watching the sunset. We also really enjoyed being able to do literally EVERYTHING on our own time schedule...when we got up, when we went to dive, when we wanted to boat dive, when we ate, etc., etc.
We stayed at Den Laman last year and will return for 2 weeks this year, but in a large ocean front 1-bedroom condo instead of a studio, and I can't wait. Den Laman is small (16 condos with full kitchens), on Bari Reef (super easy excellent diving), and has a very good restaurant on sight that provides room service.
However, if you want great beaches, casinos, nightclubs, and lots of topside activities, Bonaire won't be the best choice. In that case, you might want to look at Aruba instead.