The "http://Rollercoaster Tycoon
" series of games for the PC is an amazing achievement in programming. A perfect game for parents to play with their kids.
If you don't quite have the patience for that, here's a very cute, very cool, well done little puzzler that uses line drawing and physics as you attempt to create coasters that take your people from point A to point B, collecting coins along the way.
Very nicely done and fun to experiment with.