Most of the time I either use the park provided cable TV or over the air antenna near the large cities. For those really in the woods type places I bring plenty of DVDs and watch those. I refuse to pay the kind of money that Verizon charges for unlimited data plans in order to stream video. Next year I may buy a Dish antenna so I can pull in my local channels (if the park doesn't have too many trees blocking the sky).
Don't even think of streaming using the park WiFi or I'll be pounding on your door because I can't even get my email.