I don't think you'll find any hotel in Hawaii that doesn't cater to conventions/meetings, it's a big source of revenue. That said, there is so much to see and do off property in Hawaii that I can't imagine being holed up in a hotel for all 5 days like you would with one of those all-inclusive resorts you find elsewhere. So if there is a big event happening in the courtyard or beach during your stay, make plans elsewhere for the evening, like an awesome dinner at Merrimans or similar.

Another Hilton property that you might consider...Grand Naniloa Doubletree in Hilo, especially if you want to explore the volcano or Waipio Valley on the east side of the big island for one or two nights. I just visited it last week, they did a very nice job with a major renovation of the hotel while keeping some resemblance of classic Hawaii hotel look, it's a very scenic location, and the view from my 12th floor suite was amazing. Cost me only $150 per night! Awesome bang for the buck considering that most decent hotel rooms on the other side of the island start at $300 per night. Just beware that it rains a lot in Hilo.

If you're not tied to Hilton properties, check out the Fairmont properties on the islands. We just completed our second stay at the Fairmont Orchid, we absolutely loved it there! Beautiful property, amazing sunsets, never felt too crowded or busy despite the hotel being sold out during our stay.