Parque de la Costa is Tigre's old-school amusement park, set by the Lujan River at the edge of the delta. The rides run from family attractions to looping coasters, and the big wheel gives an easy view over the riverfront and boat traffic.
It works best as part of a Tigre day trip from Buenos Aires rather than as a destination on its own. Go for the riverside setting and a few rides, then leave time for the delta boats or the nearby market.