Until recently, trips has to be fully based on the birding guide for North-east Germany (Vögel beobachten in Ostdeutschland; Wagner and Moning 2009, Franckh-Kosmos Verlag). This splendid book with clear maps and numbered stake-outs brought already many birdwatchers to several good birding sites you might not have heard of before.
If you try bird-lens.com as a guidance, a good intro for the spring visitor you will find here: http://www.bird-lens.com/2017/04/11/observation-site-for-spring-migration-on-the-river-oder/
In the meantime, a new field guide was published: White: A Birdwatching Guide to Brandenburg and Berlin. Roger White has created an outstanding field guide for his Continue reading A Birdwatching Guide to Brandenburg and Berlin: a new field guide