I am brazilian, and I will be in Germany for holydays for about 22 days.

I already know as Brazilian, I don't need a visa to enter Germany, but there still are some requirements such health insurance and hotel reservation.

Will a reservation of booking.com do the trick? I intend to pay after my staying, I will be in 3 cities in Germany, and would like to pay after I check out, in case I change my mind and go to somewhere else in Europe or Germany.

PS.: I am also taking 1000 EUR and credit cards with me.