Also of interest is the large cave known as Tham Saowapha
which is said to extend over a kilometer into the limestone
interior of the island. Another cave, the chimney-like Tham
Chaprakong gives access to the view from the top of the hill.
Other caves on the island are home to meditating hermits,
so visitors should take care not to cause any disturbance.
Also on the island is San Jao Phaw Khao Yai, a venerable multi-level
Chinese temple high on a cliff with a spectacular view back
toward the mainland.
Situated in the Gulf of Thailand 12 km offshore
from Si Racha, its proximity to the shipping lanes has made
it a convenient anchorage for dozens of barges which transship
their cargoes to lighter boats for the trip up the Chao
Phraya to Bangkok. Boats to Ko Si Chang leave hourly from
the pier in Si Racha, taking about 40 minutes to make the
trip.
Motorcycle buffs will be intrigued by the strange motorcycle
samlors peculiar to Ko Si Chang, three wheeled motorized
rickshaws with outrageously powerful automobile or Harley
Davidson engines. These once roamed the streets of Bangkok
but were banished to Si Racha years ago. They can be hired
for about 60 baht an hour to take visitors on a tour of
the island.
