The best places near by are all illegal now. In order of distance and recommendations for beginner:
Area 2 Via Loxahatchee Road
Lake O Via Okee Tantie Park
Sebastian marsh
Kissimmee River Via Starvation Slough launch (high water only unless the boat runs ground for a mile solid, otherwise use Istokpoga Canal ramp).
Keep circling out from there, 2 hours covers a world of marsh.