When was the last time you took yourself out to have fun, and what did you do?

I recently went ice skating by myself as when I was a kid I dreamt of being a cool ice skater, and I've ended up really getting into it. I also noticed loads of people of all ages enjoying it and many also by themselves. I wondered what else is happening in the UK like this.

Whats your secret thing that you like to do by yourself to have fun (outside of home/gym)?