I am writing a travel writing about the adventures of HF and is it more suitable to write it in an descriptive and poetic way or should i pay more attention to the emotions and mindsets of the characters?

If you are truly writing it from Huck's point of view and with his voice, I would go for the simple boyish understanding that Huck has . Much of his humour comes from his musings about people and places from his own unique perspective. Unless you are a fantastic writer (I don't know, maybe you are) this will be a very tall order. If this were my assignment I would forgo the Twain poetry and concentrate on characters and mindset. Once I got going I would attempt to add some of Huck's simple but clever voice and musings into it.

Hey, let me know if I can be of more help. This sounds like a cool assignment!