Planning a family trip....?

I am planning an extended family trip to Hawaii. We will be leaving July 31 and coming back on August 9. My husband and I have six children(age 5,7,9,11,15,17) my brother has one son (6) My sister-in-law has two children(13,15) My sister is coming as well as her two sons (28,30) My nephew(30) is bringing his eight year old daughter. My mother is also coming. All together there are 16 of us. Is there any tips to making this easier. How can I keep the kids busy on the plane. What about at the hotel. Is there any amusement parks near or in Hawaii.What toys should I take on the plane.(that are not to noisy but will keep the kids occupied) We will be flying with west jet and staying at the four seasons maui.