I think this is a good minimum time for a trip, although 10-14 days is better if you want to visit multiple islands. Some visitors do visit Hawaii for 4-5 days, but it's a long way from the US mainland (or anywhere!) for a short trip, and you'll spend the first few days adjusting to the time zone change.
Is 2 days in Oahu enough?
So, during those months, it's best to observe from a safe distance. In just two days, you and your friends have seen the best of Oahu, from the bustling city to the charming country. Oahu really does have a little of everything. Above: The North Shore is known for its freshwater aquaculture farms.