Wallyball is basically volleyball played on a racquetball court. You can play shots off the wall and there are some other rules variations that you can find here:
The location is a bit tricky to find. Here are my directions:
• Take 23 south to Washtenaw east.
• Turn north on Golfside
• Turn right (east) at the Chippewa sign (right after Aspen Chase apartments, google maps shows this road as "Twin Lakes Drive")
• Take this road all the way back, stay right at the fork, until you arrive and the indoor tennis complex.
Here is a google map that will get you there:Link: < https://maps.google.com/maps?q=42.25507,-83.651867&num=1&t=m&vpsrc=6&ie=UTF8&ll=42.254093,-83.65943&spn=0.014405,0.026543&z=16&iwloc=A >