Play follow the leader outside, but don't touch the ground because it's hot lava! Not real hot lava, just pretend hot lava.
Anything you can find to keep off the ground. The bigger kids have to carry the heavy stuff, but the littler kids have to climb up in the hard to reach places first, so it's fair.
Pick somewhere you want to go and then build or climb your way there without touching the ground. You can carry ropes, boxes, and sticks to build stuff - anything you can carry.
An example of something you can build is a monkey bridge.
Take turns on who gets to pick where to go once you get there and help each other out. If you fall into lava, you have to wait until the next round.