re: "what about Bastimentos?"
I've been there a couple times, but not overnight. The town there is a not exactly touristy, but there are a couple of decent (albeit plain) restaurants. The main attractions are Red Frog Beach and Wizard Beach. Both have fairly rough surf and rips; be careful swimming. Red Frog attracts bigger crowds, by far. Calmer water is on the south side of the island (where the village is).
As far as places to stay, there's...
I've heard good things about the first 2, mixed reports on the 3rd, and nothing about the last 3 (not to say there's anything wrong with them -- I've just not heard first-hand reports).
And, there may be others...