I agree with Penn Kev. And to be honest, being that specific --photography, video--within the fly fishing industry (which is much more limiting than broader retail industries) might work against you. Not saying you can't find an intership, but I think your best opps are going to be within retail or marketing firms -- mostly larger ones -- with outdoor/travel accounts and internship programs. Since you're not quite sure what you're looking for, I'd simply focus on the creative marketing side.
Develop a hit list. Do you want to stay fairly local? Or are you willing to travel? If local, I'd start with places such as ****s Sporting Goods (Field and Stream), check Frontiers Travel in Wexford, PA, they specialize in fly fishing and hunting travel. I know larger ad agencies in Pittsburgh, like Brunner, work with Field and Stream and they have a great internship program. If you are willing to temporarily relocate, some larger companies have established internships that pay. Try places like Bass Pro Shops, Orvis, etc.
I would start by calling. You may get some responses from email but you're better off calling and finding things out by talking to real people. I work in the creative side of advertising and get tons of emails that I simply forward to our HR people. Call around ask if they would consider an internship. Speak to creative department heads.At this stage, I would be too concerned about specific jobs. Once in a place, you get to see the wide variety of jobs and where your skill sets would best fit in. Good luck to you.