Aside from the not-truly-undead Fallout ghouls, none of the undead seem satisfied with being immortal and free.
Previous posts and some podcasts have talked about peaceable skeleton communities or ecosystems but I feel like if I was a zombie I would kick back, relax, read a few dozen RPG books, play my Steam back-catalog and chuckle at the suckers who have to sleep, eat and face the black abyss of death.
Must be the eternal hunger or something, but aren't the living the ones who are truly trapped, having to eat constantly just to function?
I know many undead are necromantically bound to serve others, but given 300 years to guard a tomb you could really work on your reasoning skills. Cut a deal, work a trade! poetry, man.
Or like... mine some precious ores? Create fine and intricate artworks. you want to be a gift-shop so good they forget the main attraction.