Subbed for interest... I'm headed there this winter but not for cycling. One snippet I've read (on a non-cycling specific guide) is that around the southwestern corner of PR, the roads are steep and winding, with little shoulder and short sightlines, and lots of heavy trucks, so not recommended for cyclists. I hope to find out if that's true, or perhaps typical over-caution from a non-cyclist. I've certainly been in quite a few situations that sound like that, and it's been fine.