What ecosystem service do I think is has the most value and why?

There are so many ecosystem services available to us it is difficult to choose and they are very much connected but I chose recreation as the most important since I love to fly fish. This has allowed me many hours of fun with my boys, friends, and just myself.  Another service that is directly tied to this is clean water. Without it, there isn't much hope for a viable fishery, I guess I am not really answering the question with one service but oh well.

So now, here is the question pose to you. Can you tell me what is the most important ecosystem service to you?