Apply for the Hilton AMEX card and you will automatically receive 7500 with your first purchase and upgraded to Silver HHONORS. You can use ALON reward for 6 free nights for 100,000 at Hawaiin hotels. I used it for my honeymoon at the Waikoloa village on the Big Island - FABULOUS place!
You need to book asap as the Hawaiian rewards may be gone by now!
You can reserve now and then call in reward when you have the points with Hilton. Gives yo a little extra time to get points transferred. You can always cancel the reservation if you change your mind but need to make sure you get it in the first place.
Another thing, that Delta can be redeemed in 5000 increments and sent to Hilton for a 2-1 conversion - 10,000 right off the bat!