The surreal romance of aristocratic expat Lucy and castaway Jack enchanted me as I strolled through Sydney’s Royal Botanical Gardens in early January, following their love story on a handheld HP GPS device preloaded with Anita Fontaine’s spooky sweet Ghost Garden, part of the 2008 Sydney Festival. As I traveled through the gardens, certain locations would trigger animated scenes that revealed the story, set in the 1800s. I could feel the past, present and future all melting into one, and I got excited imagining the day when it be easy to create my own site-specific adventures for people to discover as they’re traveling through a space.

That day turned out to be less than a month away! Wherigo is a flexible gaming platform that Garmin is embedding in their new Colorado 400t Handheld GPS unit (Pictured at right. Thanks, Brady!) Wherigo Builder allows anyone to build alternate reality games, tour guides, local reviews, real estate marketing apps, scavenger hunts, pub crawls or Victorian love stories that are site-specific by mapping out zones, creating a story and then sharing it online. (Alternately, you could write it directly in Lua, a programming language whose name means “moon” in Portuguese and is also what World of Warcrafters use to build on top of their platform.) If you have a PocketPC Device, you can download the Wherigo Player and start playing.

Anything similar for the iPhone’s fauxGPS maps or soon to be true GPS?

For now, you can enjoy my Emily Approved Sydney recommendations in Google Maps and in Google Earth.