You could fall in love, get married, have a kid and raise a family. The whole process is a real eye opener and, possibly, the ultimate provider of wisdom.
"get married, have a kid and raise a family." Very much worth doing, but for itself, rather than as a part of one's education.
Sure you do, but this seems a little redundant. Your have your whole life to do any of the suggestions that might be raised unless it involves checking out certain endangered species or something :-)
There are a lot of fish in the sea... people are often just too afraid to take the plunge.
"Don't make someone a priority if they only make you an option"