On foot
Most of the city Tamsui is easily accessible on foot from the MRT station. Turn left as you exit the MRT and then right along the river.
By ship
Ferries across the river to the town of Bali and the Fisherman's Wharf depart from the Tamsui Ferry Pier, about 10 minutes north of the MRT station by foot. Sightseeing boats traversing Taiwan's northeast coast and the Tamsui Danshui River depart from the Fisherman's Wharf.
By bike
Rent a bike in one of several shops on the main road north of Danshui MRT Station. A normal rate might be $300 for the whole day. Or in Bali , hire a bike to ride up and down the riverside. (http://riversidetown.blog...) This is very popular and cheap From NT$30 for a small bike to NT$100 for a tandem per hour. Make sure you look the bike over first as safety standards vary.
By bus
The R26 bus will take you from Danshui MRT Station to Fort San Domingo or Fisherman's Wharf. The latter is beyond casual walking distance from the MRT, so the bus is probably the best choice if you don't want to take a boat or rent a bike.