During my travels, I have found Wi-Fi only in RV Parks, once in a private campground, and never in State and National parks and campgrounds.
I depend on my smartphone for internet connection while traveling, but sometimes there isn't even cell phone service at State parks. On this summer's 3-week, 2500 mile trip, I had cell phone / data service at two of three state parks and Wi-Fi only at the two RV Parks where I stayed one night each on my trip home. At Jedediah Smith State Park in northern Calif, there was no cell service for miles, and I had to drive 12 miles into town to get a signal.
In short, don't count on it unless you are staying places like KOAs and RV Parks.
<Chas>
