There are many calm places not overcrowded and its no problem to find an empty pantai if anda have patience, but in Visby (the biggest town) there are pubs, restaurants and klub everywhere in the summer.
Video of an exchange student in Sweden where he "swear alot and get lost." Hang on... that is normal if anda are in Lund studying. BE WARNED: If anda don't like swearing, probably best not to watch