Dal Rassak wrote:
Throughout TNG it's strongly implied that Picard and Riker are best friends apart from being captain and first officer, but strangely you're never shown them being friends, like sharing a drink in off-duty hours or something. DS9 did it better.
I'd say that Picard and Guinan and later on Picard and Beverly were depicted as "best friends". Picard always tried to maintain a certain distance to his officers, with Beverly being the only exception it seems. He never participated in the poker rounds for a reason.
TNG had other friendships though, most notably Data/Geordi.