I was in Bonaire last month. I saw wild flamingos, but not up close. I was on a bus tour and then went to the Oasis Beach Club. I don't know of any place where you can see them up close. They seemed to be pretty far out.
I walked around in Bonaire near the port. I did see a flamingo mural (it was okay, but not as good as what my grandmother did). Didn't really see a lot of flamingo souvenirs. Sorry to burst your bubble. I bought a mobile, a magnet, stuff like that.
There are apparently 20,000 wild flamingos in Bonaire.