There is a very small slide at Kidani, one parent can be at the top, one at the bottom waiting. While it is a straight, 3 foot slide, it is an option (also note that it seemed most kids didnt even make it off the end of the little slide, so you may need to assist to get off).
The big slide, only one at a time. Can do the split thing, but then you are guessing as to when yours will be the one coming down.