There are specific bus passports for destinations such as the Blue Lagoon, the Secret Lagoon and Keflavík International Airport, as well as bus routes specific to the Highlands or the South Coast. If you have only one location in mind, such as a countryside town, you can look at single tickets from the local bus service.
Are there any buses that go off the ring road into the Highlands?
Yes, there are specific Highland Hikers passports that take you to the most popular Highland hiking routes such as Laugavegur and Fimmvörðuháls. Please note that the Highlands are only accessible during the summer.