There are many Cham sights outside of the city. In fact, you'll see some of the most dynamic on the ride in from the airport or from the Central Highlands, but Thap Doi is right in town, just off of Tran Hung Dao Street. The two towers are unique, in that there are two (Cham towers usually come in groups of odd numbers) and that they're in town (usually on hilltops). The sight is actually less spectacular than the walk through this quiet little neighborhood to a sea inlet where you'll find a few local seafood places. The relief work on the tower sculptures is in good shape, particularly the floral lintels, and the little park area around the towers is a place to rest (but you won't be alone long; folks down this way are friendly).