If your RV Park has cable TV run already, would it be possible to activate cable internet at your site too? We've done that when staying at RV Parks with cable run (which are actually few and far between in our experience).
If you'll have a strong cellular signal, check the networks available - cellular internet is also a possibility. But will come with data caps to contend with, and possible speed issues. If Verizon is strong there, the Millenicom (www.millenicom.com
) 4G/3G Hotspot plan is great at just $69.99/mo for 20GB of Verizon data, and no contract. That's our primary internet source. They also have a Sprint unlimited plan, if Sprint will have strong signal for you.
Pay as you go internet plans are also a possibility, especially if you are a low bandwidth user. They can get quite pricey however.