Going to the Florida Keys in March. What gear, what to see/do?

My dad lived in Marathon for 10 years so I spent quite a bit of time there.

Swim with the dolphins!

http://www.dolphins.org/

Help save turtles!

http://www.turtlehospital.org/

Walk from Marathon to Pigeon key along the old 7-mile bridge.

http://www.pigeonkey.net/

Try the Lobster Matador at Annette's Lobster & Steak House, it was my favorite!

http://www.tripadvisor.com/Restaurant_Review-g34347-d514905-Reviews-Annette_s_Lobster_Steak_House-Marathon_Florida_Keys_Florida.html

Key West Aquarium, don't put your hand in the shark tank!

http://www.keywestaquarium.com/

A word about key west.

It can get very crowded "in season", between all the cruise ships and people driving in it can get ugly.

Watch out for idiots on scooters! They will cut you off, steal your parking spots, and hog the damn road.

I went once and never went back :/