Gibraltar is less than 7 square kilometres, so most of it can be seen on foot. Bear in mind, though, that some of the roads especially up to the Upper Rock are very steep. Taxis will take the strain out of the climbs, and all the taxi drivers seem to know all the Barbary macaques by name. There is a number 3 bus service that runs from the frontier, through the town and on to Europa Point. This said, travelling in a small group is problematic as most taxis are "minibus" style and the drivers prefer to fill them- or you pay for the entire taxi! This often entails sharing a "Rock Tour" taxi with total strangers. Taxi drivers are also sometimes reluctant to run you up one of the sights on the Rock as they would much rather sell you a longer, more expensive tour!