enjoy it as before you know it they grow up.... When my kids were smaller I built a fort/tree house for them with a porch and a trap door on 4 poles about 5 feet off the ground. I got some camo netting. Then a pile of ammo for their airsoft guns. It was the hit of the neighborhood. I always knew where my kids were!
Now it sits empty most of the time , once in awhile a neighborhood kid will knock and ask if he can play in it. Sure had a lot of fun while it lasted, just had to be sure everyone wears safety glasses/goggles.