There are a lot of seals in a relatively small park, even by Istanbul standards - there are dozens of them, sitting literally under every bush. Stock up on wet food packages, I had 5 bags, for the local hole it's about nothing at all. Plus there is a beautiful view of the sea and islands.
There is a beautiful view of the islands, and cat lovers need to be nice, there are dozens of them there. And on weekends there is a vernissage of local artists