I’ve done it only once when I was living in London, for fun. Had to go to Basingstoke for it, but I think they have several locations, here is the link. You can actually do it as a sport, people do some really cool thinks sometimes, like this little lady.
It was lots of fun to do it once still! Something you can definitely do with friends or family. The way it works is that there’s air coming from below and you just float on it if you keep the proper body shape.
On the day, you go there, get a proper attire and then the group leader teaches you the floating body position and hand gestures (since it’s really loud in the tube). After that, you go in one by one and do the floating. At the end the guy takes you up and down the tube, holding you by the hand and ankle. The experience quite short, you have to expect that, but it’s like riding a roller-coaster! Breathtaking yet quick 🙂
I totally enjoyed it, you can also purchase the video of you at the end 🙂 But for me it was a fun little trip to another city as well, not sure if it’s not too short to just go for it only, if you need to travel long…