Hawai'i Department of Tourism -- The State of Hawai'i maintains a website for its Hawaiian Tourism Authority that contains a wealth of information. It can be found at Hawai'i Tourism Authority.
Accommodations Inventory — Through its Tourism Research program, the Hawaiʻi Tourism Authority (HTA) maintains a listing of all properties and units available for visitor accommodations in the State of Hawaiʻi. It’s a lengthy report of 58 pages, and full of useful information about this part of the state tourism industry. 2014 Visitor Plant Inventory Report.
More Airline Seats to Hawaii for 2016 -- According to the HTA, "airlines are expected to add more than 63,000 additional seats to the state from the U.S. West market with the largest increases in inbound seat inventory coming from San Francisco (+15.7%) and Seattle (+10.0%)." See the full report at HTA Report Airline Seat Capacity Q1- 2o16.
2016 Forecasts -- The Department of Business, Economic Development and Tourism is a source of statistics as well. See 2016 Tourism Forecast for statistics on expected tourist arrivals.
Visitor Satisfaction and Activity Report -- Another interesting read is this report which provides important information about what Hawaiʻi visitors like, and don’t like. The information was gleaned by asking visitors from Hawai’i’s major source markets to rate their overall satisfaction, how well their experience matched their expectations, their likelihood of recommending Hawaiʻi to others, and their likelihood of returning to Hawaiʻi within the next five years. Interesting findings in the 2012 report showed that visitors who spend more time in Hawaiʻitend to rate their satisfaction higher than those with shorter stays. Those who visit for business reasons or to experience different cultures tend to have lower satisfaction scores. Those who come for a vacation, to honeymoon, and to visit friends and relatives tend to have higher satisfaction scores. Visitor Satisfaction and Activity Q1-Q2 2015 Report