My best suggestion is to look at state’s brochures of where you live. I think they all have them. Texas advertises in Seattle, which results in a giant fuck you to the ads, but so does California, Arizona and Utah. Oregon has catalogs on the ferry with cool things to do. Not really a process, but look around at your tourist parks and ports for info kiosks or stands.

This is pretty great too https://www.alltrails.com/us Also, Washington has a trails guide and app that is amazing for it specifically, your state might too. https://www.wta.org/go-outside/map

Perfect this is exactly what I was looking for, thanks!