There's many shops and restaurants in the downtown area. There's also a few small museums and galleries.
Giant Flea and Farmer's market that takes place next to a large antique mall. Can definitely spend a few hours just walking around trying to find some deals. Open on weekends from 9am-4pm.
Small Farmer's market near the hotel. Open Sundays from 9am to 2pm.
Mount Dora is known as a good spot to go antique shopping. There's multiple stores and malls scattered throughout the town.
There's multiple boat tours available to go on the lake as well as many small nature parks scattered on the outskirts of town.