MAMP and Drupal
I've setup a Drupal sandbox using MAMP in the BCRC. To use it, go to the Application folder and double-click on MAMP. Click the button to start the servers. It will ask for an administrative username and password, but you can just click cancel. Once MAMP is running, if you visit a web-browser, you can visit a local instance of Drupal 7. Read more for details.
The actual files are in the htdocs directory of the MAMP folder (in /Applications). They should be all readable/writable by anyone logged into the system.
The admin user on the drupal site is "admin" with the password set to "drupal".
The mysqlserver runs on port 8889 and has the root password set to "root".