Huck's background, prior to the start of the novel, does not include many of the refinements that he associates with civilization and he doesn't have any particular desire to acquire those niceties after encountering them.
Huck loves being close to nature and is very capable and comfortable when living off the land, hunting and fishing for his food, sheltering where he finds protection from the elements, and not worrying about cleanliness of body or surroundings. His reaction to living with Widow Douglas is "it was rough living in the house all the time...and so when I couldn't stand it no longer, I lit out."
Huck enjoys being active. He seeks out new adventures and action, and finds civilization deadly dull and boring.
Then she told me all about the bad place, and I said I wished I was there. She got made, then, but I didn't mean no harm. All I wanted was to go somewheres; all I wanted was a change, I warn't particular.