I have four substantial gyms, one metal and three made of Java (coffee) wood and two small "foraging" trays, which are basically a cafeteria tray and a "u" shaped PVC perch. Of course, any human limb is good enough to stand on and they seem to have taken a liking to perching on my dining room chairs as well as the table.
Here are some pictures of the 4 "big" play stands.
A Super Pet EZ Care Activity Playground for small birds and the first Java table stand I purchased (at Critter Jungle in Ottawa).

The second Java table stand I purchased (at Pet Circus, also in Ottawa).

Finally, the Java tree (which I purchased at the Canadian Parrot Conference in Guelph last year)