Enjoyable shows on ShowTime?

Well, Spring break is coming along.
Since I wont be going anywhere exciting
i’d just like to go home, relax, unwind and go
through 5 seasons (more or less) of whatever show you guys
recommend for the week i have off.

I am already watching Californication and shameless US :D
(Great shows by the way)
If the show is not on showtime but is still on a ‘Showtime level’ thats ok haha
Soo any recommendations?