okay, you serious guys? - what if they're GENIE WISHES?? yeh gots ta be specific.
i've thought about this a lot before, actually
i'd basically wish for a pocket universe that i can access at any time by creating a portal over any mostly flat surface large enough (ie large enough for what i want to move through it), which does not cost anything to make and has no delay in creation or between creations. there can only be one portal at any given time, and creating another will destroy the first. while within this area, i would have a perfectly intuitive way to change the laws and content of this separate universe - meaning there's no difference between breathing and changing things.
if the wish-granter gets bored and threatens to revoke the wish while i'm explaining this, i will simply wish to see an easy-to-understand, english, legibly written explanation of the afterlife and have the ability to rewrite it in any way i want