There are rare to no opportunities for rental of liveaboards and bringing a boat out now is difficult as the waiting time for slips is years. There are transient spaces but they are both expensive and limited to 3 months a year.
KoOlina marina has space but it is on the leeward side (an hour from Honolulu) and expensive. When we left there 3 years ago we were paying $1400 a month for a 50 ft slip...
Author & Sailor