When we must forget the trip to Vilnius, we can go to another, may be a better place. Do you have a suggestion?
if you organize stay for 30 people than it's pretty easy to hire a bus too - this is just one firm that hires buses: pks.olsztyn.pl/node/2
there are others too: panoramafirm.pl/wynajem_autokar%C3%B3w/warmi%C5%84sko-mazurskie,,olsztyn
you will also need an English speaking guide as bus drivers may not speak English