Depends on whether the Portland in question is in Maine or Oregon, and whether the trip was an extravagant package or little more than a cheap-deal flight and minimal accommodations. At a glance http://www.cheapflights.com/flights-to-hawaii/portland-OR/ shows a flight package of $1548 for 4. Camping, hostels, or - here's a thought - Craigslist might open some cheap options.