I realize this is a broad question, but my life has changed drastically in the last few months, and I'm looking to experience more before I get too old. I know the usual answers like getting married, having kids, and so on.
I'm more interested in skills, hobbies, fields of education, practices, habits, and experiences that have shaped (for the better) the person you are today.
Learning how to cook well has been the most beneficial skill I've learned in my life. Good food is paramount to happiness for me.