Author: Doug (---.aurorasys.com)
Date: 11-16-07 14:55
Not to try to answer your question but to give you a couple points to consider:
1. There are some spectacular beaches that aren't very accessible by public transportation. It might work to rent for a couple days to visit those beaches.
2. If you have a car with a hardtop, you have a place to lock up valuables. I believe Culebra is one of the least risky places in the world for crime, but it isn't totally risk-free. It'd be a flat out bummer to lose your cash or camera.
Hope this helps with your decision.