Yeah, that stinks. You could stay out your last night somewhere nearby like Cooper or, our last night preference, Great harbor, Peter, but it would require either a really early motor back to base if you're using the ferry or a more leisurely departure with a water taxi.

A private water taxi would be a little more money than the ferry, but if it allows you to actually enjoy your last night on the boat out on the water, vs. the base, it might be worth consideration.