…if I wasn’t so damn lazy:

• learn French
• learn to play the piano at a decent level
• put in a lot of work to get decent at math
• get in shape (like I told myself I would about 10 years ago), so that I could run for 120 minutes straight while playing soccer
• read a wide selection of literary classics
• practice public speaking
• get into psychology, my supposed second choice major
• read history books

The top ones tend to be at the top of my list, otherwise the order is arbitrary.