On Hawaii, I booked the Waikoloa Beach Marriott Resort & Spa. I booked 5 nights here as well for a total of 140,000 Marriott Rewards points. The hotel is a Category 7 hotel and the room was 35,000 Marriott Rewards points per night. When you book using points, you get the 5th night free. The hotel would have cost about $360 per night. I saved another $1,800.
Also, I want to point out, that when I originally booked the above hotel, I did not have enough Marriott Rewards points for the above reservation. I only needed to get them into my account before we traveled. I have since earned the points on our stay at the Atlantis (an Autograph Collection hotel, so is now part of Marriott) and because I used my Chase Marriott Rewards Premier Credit Card at the hotel. Once I had the points, I ordered the e-certificates for our free stay. I love this feature of booking through Marriott Rewards!