Smart phone hot spot. Even my most basic Galaxy phone that's many years old can act as a wifi hot spot. You just need to have cell phone service wherever you are.. But, relying on a campground wifi setup is good for email at best.. No streaming and especially no Zoom... That service takes a TON of band width and will suck data pretty fast, so make sure you get a plan that has a lot of data per month!
My office has Verizon MiFi hot spot units with "unlimited" data... But, after 15 GB it gets throttled down to a crawl.. I had a user use up all 15 GB in less than a week with just doing Zoom and Teams meeting video meetings...
Anyway, good luck!
Mitch