Have you considered a trampoline? I have assembled many different models. On the most part they are not bad. I also disassemble them, and move them to a different location, call or text me for information.
Trampolines are easy, just as long as you, remember when you put the springs on you first space them like ever 10, then every 5, then every 2, until it is done. The fun part is the safety net, sometimes it is a bear.
I would highly recommend you buy some ground anchors, we have had some major wind storms lately, and I have seen several trampolines on the side, and bent badly.