The guided tramvia — an electric tram circuit — is the main way to get around and is included in the Sun Cruises day-trip package. It stops at the main sites while guides narrate the history of each; the commentary is genuinely useful for making sense of what are otherwise difficult-to-read ruins.
Walking between sites is possible but the distances are large and the tropical heat is real. The tramvia is strongly recommended for a first visit. For those who want to explore beyond the circuit, trails lead to quieter corners of the island, including parts of the jungle that have grown entirely over former military structures.