I suppose if I knew the routes, there would be good places to bike in Puerto Rico, but if I lived and worked there, I don't think I'd be a bike commuter.
Riding in a car seems dangerous enough. Lots of side dents in Puerto Rican cars--drivers are very aggresive and squeeze in tight, tiny places. Lane markers are vague suggestions, as are stop signs. They do, at least, stop at ride lights--after 5 or 6 cars squeeze through.
Still, I loved the island. My son got married there last Saturday. I'll write more about the trip on my other blog.