From my observation, most of the online reservations only can be made by credit cards. Wonder if there is any hotel accept debit cards? And basically what's the difference between credit card and debit card???

Cash Passport is a prepaid travel money card.
A more convenient and secure way
to carry foreign currency.

Credit card is that card, you can use it for shopping as same as your debit card and have to pay after and having some limit. On the contrary, Debit Card is that card which has credit limit, how much you already have in your bank account balance.