That's great news about the wifi at Huntington Beach. Love that place! Having little ones, we have to have some entertainment. Rainy days in a 13ft would be tough without it. We use over the back of the seat DVD players for the drive. They aren't on all the time but they can be moved into the camper and plugged in to keep the kids quiet in the mornings. (little ones are ready to barge out yelling at 7am so I use the tech to benefit our fellow campers)
I'm a remote employee for my company. As such I work from the road and home. When I'm on the road, I use my Samsung phone for internet. One of the great things I've loved about them for years is that you can use them as a wifi hotspot without having to buy a separate device. So that's what I do. I work from my laptop through my 10GB data plan on my phone. (though I'd encourage you to keep the phone plugged into a charger or it will drain your battery
faster than normal) I never use that much yet. I don't watch tv online much though we have while camping watched a show on her Kindle or my laptop. I do frequently do video conferencing through it though without issue. I'm on AT&T and while sometimes don't have good signal in really rural areas, for the most part it works fine for us.
So if your phone will do the wifi access point, you may not need another device.