At the top and bottom of each page, there is a link that says [Random Page]
(if this link isn't there, click [Preferences] and then find the box for "add Random Page" or some such).
If you click this link, the wiki will choose any page it sees fit and that's where you'll end up.
It's kind of a cool way to explore or find pages that you might not see on RecentChanges
(unless the page is so cool that you are compelled to edit it and thus bring it back to the top of RecentChanges