Solo trip

I’m looking to go on a solo trip next year to the keys. I’ve been there 3 times and stayed in Marathon and Duck Key. The other trips were mainly staying at the hotel beach but now that I’m single I plan on doing and seeing as much as I can this trip. Any tips on must stay hotels, activities and hidden gems would be nice. I know there have been a couple posts for solo trips but I’m ready to branch out and experience it all. Give me your best. Thanks!