There's a saying that it's a man who must build a house, plant a tree and have a son - but why not plant a tree even when, in Eowyn's words, "I am no man"!
I had an opportunity to plant trees last Saturday (May the 9th, 2015), as the local authorities ordered afforestation in the nearby woods, and searched for volunteers among nearby citizens. We could go there, were offered a shovel and bags of seedlings (as many as we wished to plant) and were taught how to plant one. It was great fun, although time constraints allowed me and my friend (we worked in pairs) to plant only 17 seedlings. But still, that's 17 times the goal I had on this list :D Oh, and the species we planted was Quercus petraea, meaning a good ol' oak. Hope they get to grow tall and imposing!