If you have absolute power, you are immortal (you have the power to make yourself live as long as you like). Immortal has infinite lifespan, and infinite lifespan means infinite time to do anything. Since you have absolute power, you can do anything.

Result: You have done everything even remotely interesting to you, or, everything. Well, the second part takes infinite time so you'll never get bored, but I can be bored even while there would be many things I could do, it's just that I don't want to do them. So, you'd get bored pretty damn quick.

See Michael Moorcock's Dancers at the End of Time for a good example about this.