It's you, not a tour guide, who calls the shorts on this coach trip. Tickets for the Big Red Bus work on a hop-on hop-off basis, so you can cherry pick the sights you want to see and dictate the times you see them. The service begins in Alghero old town and travels north. The Nuraghe Palmavera is one of the first sights accessible on the route. The beehive-shaped huts here are thought to have been built in the 14th century BC. Neptune's Caves crop up next. These caverns were discovered by fishermen in the 18th century and named after the god of the sea. Inside, they're dripping with stalactites and spiked with stalagmites. The bus schedule also gives you the chance to stop off at Mugoni Beach. This slither of white sand is rated as one of the prettiest beaches in Sardinia. The bus has an open top, so you can take photographs without having to worry about your flash reflecting off the windows. Plus, there's an audio guide on board, which will give you top tips on all the points of interest.