Frommer's Review
For an entertaining 1-hour-long overview and introduction to the principal attractions of Edinburgh, consider the buses that leave every 20 minutes or so from Waverley Bridge from April to late October. You can see most of the major sights along the Royal Mile, the Grassmarket, Princes Street, George Street, and more from the double-deck open-top motor coaches. Three tours -- Edinburgh Tour (green buses), City Sightseeing (red buses), and Mac Tours (vintage buses) -- all cover roughly the same ground in Old Town and New Town. The Majestic Tour buses, however, make short work of the city center as they go down to Leith, as well. Tickets can be used for 24 hours, and you can hop on and hop off the bus at designated stops. The first tour is at 9:30am, and the last is usually around 5:40pm (till slightly later July-Sept).
Note: This information was accurate when it was published, but can change without
notice. Please be sure to confirm all rates and details directly with the companies in question before
planning your trip.