Minecraft on Peaceful. Very relaxing. No monsters to piss you off. Just don't swim in lava, or jump off a cloud, and you should be A-ok.
And I'm not sure it's RELAXING, but poker night at the inventory is pretty laid back and not crazy actiony while being fun (it's basically poker against Max [From Sam and Max], Tycho of penny arcade, the Heavy from TF2, and Strong Bad from....wherever he's from). I tend to play it while surfing the net, or eating, or when I just want something fun but not fast paced. I like their idle chatter. It makes it feel like you're actually playing against people and not AIs.
Dirty Hipsters said:
Borderlands is pretty much the most relaxing game ever when you're playing with friends.
0_o I dunno what Broderlands you're talking about. The one I played with my two buddies was nothing but nonstop anarchy. Raiders and skags all over us, with Badass class monsters rampaging in the mix, bullets flying everywhere, yells over skype to throw down a turret NOW, as well as battle cheers.
In other words, it was some of the best fun I've had with a shooter. ....But SOOOO not relaxing.