Lukas Nursery is a great Orlando-area nursery, and the Butterfly Encounter is a free-flight butterfly conservatory.
Photography advice: Macro lenses are good for photographing flowers. A fast intermediate telephoto is my favorite for photographing the fast-moving butterflies. A flash often helps.
Visit the Butterfly Encounter website
I went back to the Lukas Butterfly Encounter today and had a great morning photographing the butterflies.
My favorite Lukas Nursery also has an enclosed butterfly garden with tons of free-flight butterflies. They raise the caterpillars and release them into the garden. Butterflies will land on you (which isn't too freaky, if you're expecting it!). They don't mind a bit if you get close to photograph them. So I go over there sometimes to take pictures. Caterpillars Butterflies