Phantasy Star Online: Epsiode One and Two
In particular, Forest one, Cave two, Mine areas, and the Jungle areas are very calming, despite the enemies in the Mine and Jungle zones. The reason why they're so soothing is their music and atmosphere combined with the simple play style of PSO...though I've gotta shed some light on the Caves.
Cave one is like taking an afternoon walk through Hell, lava, lava, and more damn lava, and the map layout is too damn easy to remember...which is good because then you can just speed through into Cave two. Now, Cave two is a humid, watery, underground cavern which is chock full of lifeforms, ranging from mutants too lush foliage...simply put, it's a paradise after having trekked through Cave one, though in a cruel twist of fate, Cave three lies beyond Cave two...and Cave three is just dull, mind-numbing, soul-flattening dull.