Kallvik or Kallahti is a very nice and beautiful peninsula in eastern Helsinki.
There are a lot of nice options to fill your day here.
The climbing is on a single block near the SE facing shore. You'll find a couple of nice 6th grade routes and a good 7B+.
The venue is perfect for some hours of fun with some bouldering, swimming and enjoying the view of the archipelago.
Easy but fun mountainbike trails can be found in the forest.
On the southwest, you'll find a beautiful sandy swimming beach, which is also popular with wind and kitesurfers.