Bus and Van Travel
No easy network of buses links the towns in the Porta del Sol region of northwestern Puerto Rico. Some municipalities and private companies operate buses and large shared vans (públicos) that travel from one city to another, but schedules are loose. But if you're adventurous and not easily frustrated, it's possible to arrange for cheap transportation from San Juan to Aguadilla, Rincón, and Mayagüez, among other towns. Prices from terminal to terminal are set, but drivers may go to another destination if arranged beforehand.