I thought most who are somewhat active in crypto at least heard about travala at some point. It's indeed a site were you can book Flights, Hotels, & Activities similar to booking.com and others with the benefit that you easily can pay with crypto and you can get good discounts when staking their AVA token or when you pay with their AVA token. It should be the go-to place that everyone in crypto uses for their travel for as far as I can see. I don't believe there are any hidden restrictions.