The Muni Passport (Muni Pass) is a pass for city transportation that allows unlimited use of the Muni transportation network (metro, buses and streetcars) and the historic cable cars.
It is important to remember that the Muni Passport cannot be used on BART transportation, so it’s not valid for getting to the airport.
The best place to buy a Muni Pass ticket is in the San Francisco Visitor Information Center. It is located very centrally (on the junction of Market St. and Powell St.), and is also a good place to get tourist information and good discounts.
When you buy it, the Muni Pass does not include the period of validity, so you will need to mark it yourself by scratching the circles which indicate the month and dates of use, in consecutive order.
The Muni pass is good deal if you are planning to use public transportation at least a couple of times a day (especially if you will be using the cable car, which costs $5 per trip).
If you also want to get free entry to the most important museums and attractions, a 7-day Muni Pass is included in the City Pass.