Wikitravellers typically include one or two paragraphs about themselves personally and their areas of interest in Wikitravel. A portrait photograph or other picture may be appropriate but isn't necessary. Some Wikitravellers also keep a list of articles they've worked on (a brag rag) on their User page.
Remember that Wikitravel is not a personal home page service or a vacation photo service. Overloaded User pages are considered a form of abuse.
On the User page, a User contributions link to the additions and improvements a user has contributed to Wikitravel appears in the toolbox in the left sidebar. The User contributions page looks pretty much like a Page history page, with the same fields.
Wikitravellers should use their User page for developing new ideas about Wikitravel, or for putting together a "toolbox" of frequently-needed text and Wiki markup. It can be helpful to create subpages (example: "User:MyName/Sandbox") for tools, brag rags, new article brainstorming, and TODO lists.
It's possible for other users to edit, change, delete, move, overwrite, add to, or otherwise mess around with User pages or subpages. It's generally considered bad form to do so, though, unless invited by the user.
It's important to remember that while User pages and subpages don't need to follow the style guidelines for Wikitravel articles -- after all, these are for personal organization and use -- all content must be under our copyleft.
If another Wikitraveller posts new text on your User talk page, you will see a small red flashing light at the top of the page next to "my talk".
User talk pages also have a Email this user link in the toolbox on the left menu. Because email from the site can be disabled by the user, however, it's often more useful and preferred to just post a comment on the user's personal talk page.