Retire on a boat for like $3-4k/m and live pretty well, see the world. That's still a lot tho and your money will run out in a few years, unless you figure out a way to make $50-60k/yr on a boat (so you have some cushion, because you won't be employed all the time in this scenario).

Couples routinely live like this for $2k/m, so it is possible.