Matt and I caved.  We finally gave in and bought the trampoline our kids have been wanting for years.  Our friends came over to help us set it up, which saved us sooooo much time.  And now, even though it might ruin the lawn, I have to move it to mow, and we have to figure out what to do with it when we move, I am thrilled about it.  My kids laugh and smile, play together, move and go outside more, and have a fun thing to do with friends.  It is great.