Delta is currently running a promotion where you can save anywhere from 10,000 to 25,000 miles per award ticket to Hawaii. Note that there is a separate booking option for Delta One than First Class, since it is possible to get lie-flat seats on certain routes! Also keep in mind that while you can receive complimentary Medallion upgrades from Economy to Comfort+ or First Class, you can’t to Delta One.
If you have any travel planned within the travel period, give it a gander! You can see the full details on the promotion website.