I collect patches from the places I go. My kids started me down this path taking Scout trips, then DS really kicked it into high gear after he went to National Scout Jamboree and came home with hundreds he traded.
Both GA and FL have state park patch collector series with large state park emblem and small patches (less than 1x2 inches) that go under the large. Just gotta keep working on completing my set of GA patches... lots more state parks and camping trips to go.