Visit many Soviet monuments that remain in Tiraspol since the days of USSR. You may also want to visit the local drama theater and local museums near the center of the city. The war museum near the parliament is also quite interesting; note that foreigners have to pay ten times more than locals - 20 rubles. There are cheap boat tours on the Dniester which take about 30 minutes; just enter the boat, the guide will collect the money after the ship departs.
Iceskating - near where the mashrutkas from the Ukrainian border arrive is an icerink. 65 rubles.
