Information and accommodation addresses can be found on the following websites:
WDW Rynia
http://www.dwwam.pl/98/DOMY-WCZASOWE/WDW-RYNIA/KONTAKT/
Marina Diana
Hotel 500 in Zegrze
Wiejska chata
http://www.wiejskachata.waw.pl/kontakt
other
http://www.lokale-wesele.pl/firmy/detale/1779.html
In this area there is a lot of small hotels too.