There are a host of different beliefs about the afterlife. While I don't believe in reincarnation, I do find the idea fascinating. Some belief systems posit a return as a human. Others suggest a return as an animal. So, what would one learn in that case? And if we return as a human, how much of our current life decisions will we have to atone for?
There are other considerations. How much to we remember? Is there really such a thing as past life regression? Are we always the same sex? Or do we alternate from one to the other? Are we reborn in the same country? Or do we reappear on some other part of the planet? For that matter, how do we know that we're necessarily reborn on this planet and not in some other part of the universe? Or possibly another dimension entirely?
After all, if one believes in a supreme being, the Creator of all life in the universe, then what would prevent the Creator from placing us in some new environment or in the body of creatures that are wondrously strange? I admit that there is something attractive in a second chance at life... a second chance to make new decisions. But I find myself skeptical that we would really be afforded that opportunity--and even given the opportunity, I'm not sure that we would make any better choices the second time around.