Most folks approach the island from the sea though you can fly into the airport at Kamari. Whether you arrive by cruise ship or ferry, you will have to navigate the almost vertical climb to the top. There is a cable car in Fira, the capital, below which most cruise ships will anchor, or the hair-raising switchback road to the top from where the ferries dock. Either method is a good excuse for hand holding, especially if you dislike heights! If you want the adventure of riding donkeys from the beach to the top in Fira (or even climbing the donkey trail), that is an option too and might be an event to look back on in years to come. Note, the memory of the smell might have left you by then but seriously, it is not recommended.
Santorini, besides having the various towns and villages along the coast, has an extensive inland portion where you can climb even higher and witness wispy clouds floating by below. From these lofty perches you can survey the numerous wineries, scattered houses, and the sea beyond. Many wineries offer wedding venues, and the ones overlooking the sea provide a stunning back drop for photos of the day. In addition to wineries, there are many villas, hotels, chapels and dedicated venues available for the wedding of your dreams.