Bucket Lists

I randomly decided today to start my so-called bucket list.

The one item that I have on my list is to travel the blue ridge parkway and skyline drive by bicycle.
570 some miles. Not necessarily in one day. maybe over the course of a week or 10 days.

For a non-biker, am I nuts?

What's the term for the pipe-dream objectives like a bucket list, but there's no realistic way of achieving them?

Like driving to Prudhoe Bay, AK? Starting from the contiguous 48?
That, even to me, is a little crazy.