Formerly the site of a sugar factory, today Santi Chai Prakan Park is a tiny patch of greenery with a great river view and lots of evening action, including comical communal aerobics classes. The riverside pathway heading southwards makes for a serene promenade. The park`s most prominent landmark is the blindingly white Phra Sumen Fort, which was built in 1783 to defend the city against a river invasion.