Me, my sister, and father had a great time. We did the 10am appointment on a Friday for kayaking and it wasn't crowded. We had a full bus of people, but I wouldn't call that crowded.The staff was nice, friendly, and clear with directions on what to avoid on the river. Well worth the money and I plan to go again. A little slice of adventure in a safe 2 hourish time frame.
This place is family friendly. When we went there was some family gathering with tons of little kids and they did fine from what I could tell. My father always says "If you see families bringing their little little kids then you can tell it's safe." They have big rafts you can rent that fit like 10 people. That's what this family used.
No experience required but don't expect them to hold your hand. This is a real river (although its only like 3ft-4ft deep so not a raging river). You might run into poky branches, rocks, fishermen, or other people. Your arms will get sore from paddling the boat because kayaking is hard. If you've never paddled a boat, they aren't going show you (I bet they would if you asked or watch a YouTube video. It isn't hard. You'll be okay just sore).They're there to bring you up the river, launch you safely, and make sure you get out safely.
Personally, I wouldn't tube down this river. It's really cold, it's shallow with some big rocks that are easy to run into, and it's hard to control where you're floating if it's windy. You can easily run into some branches in the kayak, and in a tube I'm sure it would be even easier.
As for COVID-19 I wouldn't expect anyone to wear masks here because there is plenty of space to social distance and unfortunately many Utah residents are choosing not to wear masks anyways. Maybe the office workers should, but certainty not the men who drive you up to the river and help launch you. They had us dunk our life jackets in sanitizer after we were done using them. If you're really concerned about sharing life jackets just bring your own.
And if you're really worried about COVID-19 just stay home.