It's funny, because I am an INTP, my brother an ISTP, and our childhood styles couldn't have been more different. My parents could park me in a corner with some blocks, legos, GI Joes and I'd sit there and go to town, whereas my brother was all over the place breaking things over my head while I pretended he wasn't there. Most of all, he loved having an impact on his world. He wanted to get to the top of something. He wanted to move something. He wanted to break something. It's like they want to force the environment into as many configurations as possible so they can see what it looks like.
So, anything that offers the SP the chance to interact and overcome environmental obstacles is something they'll probably love. My brother loved gymnastics and loved playgrounds. I'd create scavenger hunts, where the object or goal is clearly visible, but some kind of physical obstacles must be overcome to reach the treasure/prize.