Maybe the best way to do those is to make some go-karts that can be used on normal roads Then can use some of the roads to design a go-kart track.
I don't think there is enough room in the AuzSportObjects for anything as only 3 ID left.
I think future sporting objects might have to go in the AuzObjectsAddOns set.
In the mean time:
AuzSportObjects
I fixed the pools by adding the stairs and handrails so people can get out of the pool.
And also finished the swimming pool with people in it including snow versions with people ice skating.