Befriend Locals. Tinian is a tourist friendly and safe island. From offering you free meal to free rides are one of the things to save while venturing the island. Some might give out fruits and vegetables too!
Stay on the Village. Being within the village is an advantage as you can just walk to stores, to beach, to nearby cafes and to your hotel.
Camp on the beach. You will have the best experience camping on the beach of Tinian as it has a fine white sand, turquoise colored water, free shower and restrooms. Although coming to Tinian requires a US visa and airfare offers a hefty price. Via Hongkong route is the best choice if you’re backpacking.