The Blankensee can be overlooked best from a boardwalk near the village of the same name. Close views of Bearded Tit and Reed Warbler, with luck also Penduline Tit, are possible from the boardwalk (no scope needed). Great Bittern is often seen flying out of the reeds near the boardwalk, especially in winter. An occupied Osprey nest can be seen from the boardwalk in summer.
Thousands of ducks and geese are on the lake in winter. Smew, Goosander and Common Goldeneye give good views. Others are Common Pochard, Tufted Duck, Eurasian Wigeon and Gadwall. White-tailed Eagle is regularly seen. The most common large gull is Caspian Gull.
May is the month for Black Tern. With luck you can get White-winged Tern and Whiskered Tern, too. Other good birds in spring are Black-necked Grebe, Northern Pintail and big flocks of swallows.
Walking through the village (European Serin, White Stork), make sure to have a look for Common Kingfisher along the river Nieplitz.
On the walk to the tower in the north you pass the small lake Seechen (diminutive of lake "See"). Chances are good for Common Goldeneye, Little Grebe and Red-necked Grebe. From the tower you overlook the wetlands of the Ungeheuerwiesen. A breeding Osprey, Northern Lapwing, Common Snipe and with luck Hoopoe can be seen. In winter Common Crane, European Golden-Plover and northern geese are typical species. Great Grey Shrike is regurlarly seen in the open winter landscape.
You can get to Blankensee (Trebbin) by car, bus or bicycle. There is no useful train connection. There are two free car parks in the village of Blankensee from where it is best to walk to the observation points. The boardwalk is wheelchair-accessible.