build something really cool in the middle of the woods and leave it there for someone to find

Often, during the many camping trips I went on with my brother and sisters, we’d build forts in the forest. Actually it didn’t matter, forest or no forest, after our tent was erected, and the cookpot on the campstove, we’d scuttle off to create a structure with whatever natural elements happened to compose our environment. Pine cones, moss ball “mops,” Saragosa seaweed, rocks, bark, spanish moss, and numerous other mediums became construction materials. We always left them behind for other folks to find. They probably thought the fairies had been in attendance. :)