Here is what I do when I travel with my kids (and yes, we travelled when my son was that young).
I pack enough clothes to get through the trip.
Lots of blankets, preferably the junky ones that you don't care about if they get dirty or yucked up, and 3-4 of the large ones that you can use to put baby down on the floor with.
Gate check your stroller and carseat that way you don't have to lug it through the airport. When you check in at the front desk, they will take your carseat and have it waiting for you at the gate. And then just wheel your stroller up to the gate and they will stow it for you under the plane and have it waiting for you outside the plane door at your next arrival.
For bottles, formula, wipes, and diapers I bring enough to get through the first day. Then I hit the local Target or Walmart and buy what we will need for the whole trip. Most of the islands of Hawaii will have a Walmart or Target (my family comes from hawaii). Since my son was on formula at the time, i just put in the correct amount of powder formula into the bottle and put 4 bottles into the diaper backpack bag. Then on take off and landing I would just pour water and mix and then feed him with the 1 or 2 bottles of water that I also had in the diaper bag.
I would also take some ziploc baggies for any stinky diapers that you might have to change on the plane. Then you can give them to the attendant and have them throw it away in the main cabin trash. Also good for if baby barfs all over themself on the plane...you just change them and put the yucky clothes into the baggie.
Bring a few comfort toys/items for the plane. Then pack the another handful of toys to play with during the trip. Since your baby is so young, you won't need to pack too many of them.
Once we arrive I just buy a small bottle of dish soap and wash all the bottles and stuff in the hotel room each night.
If you have a small travel bath tub thing that would be good too since you never know how clean the tub in a hotel really is. Or you can bathe them in the sink since your DD is still pretty small.
Bring lots of SPF protective wear for your baby since she is still too young to put sunscreen on.
As for the sleep issue...just play it by ear. You know what her sleep signs are. With my two kids we usually plan to do one activity a day and plan with flexibility in mind in case we see the kids are too tired and we need to head back to the hotel.
I highly recommend using backpack style carryons when travelling with kids. Plus it reduces the amount of times you will knock the heads of other passengers while passing through the aisle while getting on the plane.
Oh and try to ask for bulkhead seats when you check in. They give you a little more leg room/baby walking/soothing room.
Don't forget to bring your carseat for riding around Hawaii, or see if you can rent one from the car rental place.
Most hotels will have a pack n play or small crib that you can reserve ahead of time. I would bring your own sheets and blankets though.
I know another Mom suggested bringing your boppy. For me it was a pain to have to have another thing to carry on so we just brought my Maya Wrap Sling. So if you have a baby carrier/Baby Bjorn you can use that in the plane to help soothe your baby.
Good Luck and have fun!