Definitely try running a full Linux distro with it, it's pretty fun and a self-rewarding task, even if you don't end up actually doing anything with it. But you may still find it useful in some ways, for instance, you could run a full fledged desktop Firefox with support for ALL addons, use it to inspect and debug web pages etc.

And if you feel like it you could take it a step further and install Zink and Box86 to play Windows games.