I already booked the cave tubing this morning. First you have to send a request, and they verify they have room, then they send you a link in order to complete your reservation. All very simple. :)
They even provide "alternate" options if they are unable to do the trip due to weather. I didn't really want to do any of those though, and opted to not go at all if I couldn't go caving. :)
Woohoo! I'm really looking forward to this one!
~Bunny