Flight
Please be sure to fly into HNL (Honolulu International Airport) on Oahu! Oahu only has one airport.
Rental Car
If you'd like to explore the island outside of a 5 mile radius of where you are staying, YES please get a rental car. Be sure to also check if your place of stay (hotel / Air bnb) offers parking. If not, there are ride-share options (Uber / Lyft) available; however, please account for cost, as these can get pricey depending on the distance and time (rush hour traffic).
Hotel
Waikiki is the tourist hot-spot and is a good place to stay if this is your first time visiting Oahu. There are many hotels, restaurants, bars, and the beach just a walk away! Be weary that it is very touristy and is a far drive / uber to and from the wedding location (approx 45 mins).