Trzaskowo Golf Club
A beautiful golf course 30 minute drive from Poznan.

Hotel Solei – Strzeszynek
Driving range with 30 golfing stations, lessons available.

Malecka Katarzyna – Szkola Jazdy Konnej
Right behind Rusalka Lake.

Posnania Mall
Small but very nice.

Chwialka
Open year round.

Malta Lake
On the West side of Malta lake only in winters.

INEA Stadium
Open until March. 

Three locations in Poznan
20zl/60min for students
They also offer acrobatics classes on certain days.

Klub Bilardowy Hades
In the old castle, try to reserve before, also have karaoke and darts.

Ulan Browar
City Park – awesome for big groups.

Black Ball Pool Club
Old Town

Blokhaus
Bouldering.

Climbing Spot
Near Cytadela Park.

Termy Maltanskie
Consist of three different zones – Blue, Green and Yellow (Sports Pools, Water Park and Saunas), costs of ticket varies with what zones you want to visit and how much time you plan on spending there.
If you go over the time you paid for you have to pay 0.50 zloty/minute.

Wake Park Malta
Right on Malta lake, very easy to get to.

WakeSpot
A short drive outside of Poznan, with clear water and a man-made beach and a snack bar.