Free: Contests & Raffles.
National parks is a great idea. Being an archery elk hunter on the west side I would prefer you not do it but I dont own the animals or the woods. Any chance you could tag along and take picture with a hunter? He might need a good caller.
Also you might want to consider the legal aspects, hunting without a tag for instance....according to the definition: ANY effort to kill,capture,injure,or HARASS a wild animal or wild bird Not just other hunters might have a problem....