That is a great idea! Never thought of going back for fun.
I love it!
By the way, some community colleges allow senior citizens to audit classes for a very low fee. In my state it less expensive to audit a community college class than to take the enrichment classes offered at night at the local high school.
I chose to pay for the courses. I still have a little bit of Girl Scout in me and I like collecting the credits. I have now have more than 90 credits and have decided to apply them toward an associates degree in my area of interest. Just 4 more classes to go.