The Village Green at Hilton Hawaiian Village. It has a waterfall next to it.
Tapa Ballrooms in the tapa tower. It is next to the village green.
Uber, Lyft and taxi are all available and affordable. The best place to get dropped off is at the lobby. Self parking is $10 and valet is $15. Don't forget to validate at the reception table.
The wedding hotel is on the Ewa end of Waikiki. Closest hotels are Ala Moana Hotel, Doubletree by Hilton, Trump International. Generally the waikiki area hotels are all close enough for a short car ride under 20 minutes.