Cytadela
Perfect for bike rides and has open fields for sun tanning or playing games
Rusalka Lake
Can rent water bikes & kayaks, has beach volleyball courts and a sand beach.
Streszynek Lake
Past Rusalka and much larger lounging area, same facilities as Rusalka along with basketball courts, a nice restaurant and snack bar and places to make a bonfire.
Kiekrz Lake
Largest of the lakes around Poznan, has a nice bike trail going around it.
Malta Lake
Full of restaurants, activities and nice trails.
Park Dabrowskiego
Right next to Browar.
During the summer months has free Yoga classes and movie nights among others, nice place to relax in the middle of the city.
Park Kasprowicza – Arena Park
Has events like Food Truck Festivals, Vegan Festivals and other fun stuff happening inside of the Arena building.