Travel bloggers around the globe today are posting about Passports With Purpose. We are getting together to build a school in Cambodia this year. If you have been a listener to the Amateur Traveler or a reader here at the blog then you probably have some idea how pleased I am to be involved in a project like this that leaves the world a little better off.

The way that Passports With Purpose works is that travel bloggers and sponsors have gathered together a series of prizes. As you contribute to the project of building a school you are also entering to win a prize.

I am trying something different this year and donating a personal walking tour of one of my favorite cities – San Francisco. The walking tour will be for up to 4 people and I will spring for lunch. It can be customized for your group but I had in mind:

• Union Square
• Chinatown
• North Beach
• Pier 39
• Lombard Street
• Fisherman’s Wharf

The tour I have in mind will involved hiking some hills so you will need to be in good shape. If you would prefer a custom driving tour of the city can be substituted. The tour would need to be scheduled for some time in 2010. The value that I am putting on this trip is $100.

It is also not too late for you to donate a prize.

Check out our full list of prizes and choose the ones you would like to enter to win.