The ceremony and reception will be held on the lawn of Embassy Suites facing the beach. It's likely to be hot in September in St. Augustine, so we're planning for people to wear nice Florida attire, such as nice khaki pants or chinos and light breathable shirts (e.g., linen or cotton) or sun dresses.
From the Jacksonville Airport you can use either Uber or Lift. St Augustine also has a shuttle service to the Jacksonville Airport. Their URL is https://www.airportshuttlestaugustine.com/. From the Orlando Airport it would be best to rent a car.