I am flying from N.Y.
If I may ask, Which island did you enjoy the most?
Looks like there's plenty of 40K Coach/75K First availability on Delta..
Which island? That's a really tough question. All of them have plenty of great beaches but here's a few quick totally random thoughts. Don't spend less than 5 days on an island, just not worth hopping for that.
Oahu: Beautiful but "touristy." Pearl Harbor. Dozens of high-rise hotels on crowded Waikiki Beach. Lots of opportunity for paid activities. Only shul in Hawaii that's walkable to the tourist areas. Most flights go into Honolulu but there's no major compelling reason to stay.
Maui: Much less touristy than Oahu, many people find it the right balance between nature and tourist activities. One of the most fun and gorgeous drives in the world on the Road To Hana. Sunrise at Haleakala. Great whale-watching in the winter. Miles of great beaches with great snorkeling.
Kauai: The least touristy/developed of the islands. I love all the incredibly fresh air and all the green everywhere! Grand canyon of the pacific, na pali coast, great hiking... 13 miles of deserted beaches at Polihale. Awesome snorkeling at many beaches.
Big Island: Less green, more black. Lava everywhere. Active volcanoes with lava flowing fireworks. Tallest mountain in the world (measured from the base) in Mauna Kea with breathtaking sunsets and stargazing. Incredible beaches.