HenryW is right. It is Lipno Nowe. People in Leszno say Lipno but train station is Lipno Nowe.
You have train from Poznan Główny at 4:45 pm in Lipno at 5:53 pm
next 5:45 pm in Lipno at 6:56 pm
and next 6:40 pm in Lipno at 7:54 pm
Trains direction Leszno or Wroclaw in timetables at station.
From hotel you can take or book taxi to Leszno. In day should cost about 30-40 zlotys (6-8 pounds)
If you will need more info or help I can leave you my polish mobile number.