Regarding liability waivers... We were on Maui years ago riding bikes down Haleakala. We singed that waiver knowing that it was more about everybldy trying to pass the buck. The guide said, "Sign the waiver; if you do anting stupid we an sue you."
We have done a drive to a winery here in Arizona for a number of years. We provide lunch, limit the tasting to a few varieties, and then have a drawing and games after the tasting. The people pouring the wine to taste are careful, so far, a "taste" not several ounces.