Though I don't know Wikitravel's setup nor mediakwiki itself in detail, I found the script path.

The file "api.php" is located at "http://wikitravel.org/wiki/XX/api.php".

XX is language code or shared. For example;

• English version → http://wikitravel.org/wiki/en/api.php
• Japanese version → http://wikitravel.org/wiki/ja/api.php
• Wikitravel Shared → http://wikitravel.org/wiki/shared/api.php

How can we make use of this?

-- Tatata

The official documentation is here:

http://www.mediawiki.org/wiki/API

My understanding (as of Wikimania 2007 back in August, at least) is that the API is still rather experimental.

Cheers, -j.