Does it ever seem that you're constantly telling your children "no"? Don't run too fast, don't climb because you'll fall, stay near me in case you get lost... So, give the children a taste of freedom and head to some local woods or parkland where they can run wild a bit and enjoy some freedom. As long as you can see them at all times - and there is no real danger around - let them play for a while without your intervention and see how they enjoy spending some time free of constraints. Running around for a bit is good for them and will probably wear them out too! Study nature with them, collect some large leaves, pine cones, interesting twigs and other natural debris and use them to make craft collages or models when you get home.