40 things to do before I reach 40

I reach forty in 2 1/2 years so have decided to draw up a list of activities and achievements to reach before then.  So far I have:

1. Visit Scandanavia
2. Learn a foreign language

Hopefully I will have drawn up a list of 40 by the end of the month.  I will keep a blog of my achievements over at http://40thingstodobeforeireach40.blogspot.com/

Suggestions for my list of 40 welcome, although nothing too dangerous and physical please.