Hawaii for 2 1/2 weeks!

Hi all! My fiancé and I are planning about a 2 1/2 week honeymoon to Hawaii in July. We are planning on doing 2 nights on Waikiki beach, 2 nights in Lanai, 7 nights in Maui, and 5 nights in Kauai.

Looking for any and all recommendations! Hotels, activities, favorite things to do, pro tips, etc. thank you so much in advance!!