Find sizes that work at K-Mart or mom's kitchen. Go to the Afterdeck bar at Louies Backyard and buy a bottle of insulator to protect your lenses from banging something. Filters, polarizing, UV, whatever, have them. Now you are in Key West and want to get some good pictures. If you come on by Mosquito Coast and bring me a good cigar I will tell you some of my favorite places depending on your interests.
Land based there are birds, Key deer, and exotic vegetation to name a few.
Marine environments include shallow water costal shorelines and the fish, birds and plants of these magnificent places. Our days are wonderous now, with fronts coming through followed by days of brillant sunlight. Potential for great photographs everywhere. Don't forget the human side. Great and noble buildings, neighborhoods, people galore, a cemetary of no small fame and not least, that special thing that you alone find and capture on film to share with others.