(First of all, please forgive my poor English as my native language is not English. Thanks, G**gle. 
)
Not a few places use ‘sport=karting’ or ‘leisure=track’ for ‘Luge’ for leisure, but I think ‘attraction=summer toboggan’ is most suitable for leisure.
I’ve written down my thoughts on this, so please take a look and if you have any other ideas, please leave a comment.
(The content is not difficult, so I think you can understand it with machine translation.)
<About the properties of ‘Luge’ for leisure>
https://www.openstreetmap.org/user/%EA%B9%A8%EB%AA%BD_dreamy/diary/399323
- image for reference :
