Siikaneva is the largest unified marshland in Pirkanmaa and one of the most important mire conservations area in the province, which makes it also a nice place for birds. It hosts one of the SMEAR stations data collection points with a nice collection of sensors and a beautiful wooden plank path to explore it a bit.
In addition to the state-administered mire protection area, Siikaneva has a private nature reserve. More info form metsähalitus pages here