Buckethead is a very strange, but very good, rock guitarist named Brian Carroll who gets his name from the fact that he wears a fried chicken bucket on his head (along with a white plastic mask). He reportedly created the Buckethead persona to emphasize his music over his personal identity.
Most mainstream music fans probably haven't heard much of his music. He was for a time part of Axl Rose's reconstituted Guns 'n Roses from 2000-2002. This included an appearance at the MTV Video Music Awards in 2002, which is the only time many mainstream music fans may have seen Buckethead perform.
Bucketheadland is his official Web site and it has an amusement park theme, but no such place exists off of the Interweb, AFAIK. I think the raised by chickens idea may be a fictional consruct too.