Shipping to Hawaii requires no special forms. Just extra $$$$ depending on the size and weight of package and the shipping distance. And there are some restrictions as to what can be shipped (no fresh produce, exotic animals, etc.)
For first class mail, it usually takes 7-14 days for something to arrive.
For Priority Mail (my favorite), West Coast is 2 days and East Coast is 3 days. On a rare occastion, it might take 4 or 5 days.
UPS 2nd Day Air is the next best option for small items. Usually between $10 - $20 dollars. For larger items (desktop computer, exercise equipment, etc.), I paid $50+ for shipping.
FedEx is also another option, and the USPS now works with them for some shipments. It's great for letters, but for pacakages I like UPS.
Ground shipping (actually, it's by boat) takes several weeks.
Lastly, Hawaiian real estate was great in the 80's, but since then, the market has been sour.