Hotel staff and parking are gnarllyyyy. Id suggest to not rent a car if staying here. Parking "for private units" (they seem to be upset about private unit people) is first come first serve starting at 4pm to 12pm the next day. This means in order to get a spot you have to be back there at 4 before they sell out. You do get In and out privileges if you get a spot after 4pm. After 12pm the next day, you must leave at 12pm and only get 2 hour visitor parking between 12pm- 4pm.
This was really hard because if you miss grabbing a spot at 4pm, good luck finding parking in Waikiki. You'll have to park put of the city and Uber back to Aloha Surf hotel.