In reply to Paul Atkinson: only been in winter but I hear that places like Morskie Oko can get VERY busy (1000's of people daily), especially in the holiday periods. Zakopane is a great place. good food, good drinking and questionable street vendors selling questionable goods!
as mentioned, you don't need a car to get around. the buses are cheap enough but watch out for some bus drivers will try to charge you over the odds.
the mountains are beautiful regardless which side you climb them from though they are marred by the chains and the way markers painted on the rock.