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.
No stickers here. We like a clean uncluttered look. As for places we've been, we rely on memory and photos as long as we can and if dementia eventually kicks in . . . well, we wouldn't remember what the stickers meant anyway.
I put them on an old steel Coleman cooler. My collection dates back about 25-30 years. They're a nice reminder of places we've traveled to and camped at along the way..
No, I've never felt the need to advertise my travels. If you are going to be a rolling billboard for those places I hope they at least gave you the stickers for free.