Ours definitely both love the laser pointer, and when you play with them they interact a ton. The rest of the day they are pretty content to be lazy sleepers. I know it is normal for them to sleep 16 hours a day or whatever, but am hoping to find something fun and physically active that they'll go for when we aren't playing with with them. I'm curious if there is a "go to" that cats go crazy for that is a bit more self-entertaining, that keeps them on the active side versus being lumps in the sunbeams. Maybe I'm just jealous of those day-long sunbeam naps though...
I've seen the hamster style wheels and they seem like a crap shoot - spend $$ and then they may or may not use the darn things. I like the climbing wall ideas, as that could work well with our existing tree structures for them. I also like the suggestions to use these as hiding places for food etc., or even integrating a bit more "prey play" with toys and strings.
This summer we installed a cat door to the deck (which is above ground and has no escape route for them) so they could come in and out throughout the day. That was a big hit for them. Lots of birds and bugs and stuff to chase, which kept both of them moving. Unfortunately they are a lot less interested in going outside now that our Winnipeg winter has arrived!