My friend owns a local outdoor recreation equipment/rental/guide shop. He actually said he'd kill for an app like yours based primarily on location. He and his wife like to go on road trips and seeing which areas have more activities available would help them prioritize where to explore. He cited the maps in the MTB Project mobile app as a baseline interface--the shortcoming with that one being that it's too narrowly focused on biking.

He's also big in the local Chamber of Commerce and said that lots of Chambers are willing to spend money to position their town as outdoor-friendly.