Realtech makes a booster that will enhance the strength of the signal and help manage the use of adjacent wifi hot spots that are not password protected.
Band width which affects the number of online users in a hot spot is fixable only by trying to get on when the rest of the campground is asleep.
Many times the campground wifi machine will simply be down, asking the CG office to rest the machine fixes the problem.
Ask for a site closer to the transmitter if you do not have a booster.
Plan to get date critical transaction done several days before due to allow searching for another hot spot.
NSA, Snowdon, and the Belarus folks assure me that there are no absolutely secure transactions. My bank account numbers were snatched 2 years ago in a bank to bank transaction completely unrelated to transactions that I had requested. You must have other means of protecting your critical info.
pops