Hi amylina. I'm not sure if you've found a place yet, but I was also searching for a private estate to have our wedding and came across this one, Bali Hale Cottage. It's quite reasonably priced, however there is a 5-night minimum. I spoke with the owner as well as the site manager and they both seem fantastic. A bonus is that this property is located on a private orchard, where you can pick all the fruit you want. This seemed like a nice idea. Anyways, take a look and hopefully this helps.
Launiupoko, Hawaii vacation rental by owner: 1 bedroom Cottage rental that sleeps 2. Bali Hale Cottage! Five Acre Estate New Price Only $630/nt!!
We are thinking about using Vickie from Dolphin Dream Weddings. She's been absolutely wonderful with prompt responses, and keeping an eye out for the best deals.