If you don't have A/C being on a slip can sometimes get a bit warm depending on location and wind direction. I wouldn't worry about it at Leverick, but at BEYC you are fairly protected from the breeze when on a slip. Virgin Gorda marina can also be pretty warm. Not sure about Peter Island, but it looks like the island might do a pretty good job at blocking the east winds as well. Of course if you have A/C just plug in and enjoy the night.

Another place to check out might be Scrub Island. Great pool setup that's open 24 hours and a couple good dining options. It is a bit more developed than the other islands, but a great place for some R&R and enough to keep us occupied for a night or two. Once again though, there might not be much breeze on the slip there.

Matt