You would want to fly into the Rio de Janeiro (RIOgaleão - Tom Jobim International Airport) and from there it is a two hour drive into Búzios, RJ.
Yes, from the airport to the location it is about a two and a half hour drive. We suggest that you book a shuttle with the link we provided on the faqs page/below or call the hotel you decide to stay with for the week and ask them about transportation options. You can also rent a car for the week if you want. Link to book shuttle for airport and back: https://www.getyourguide.com/rio-de-janeiro-l9/armacao-dos-buzios-sharedprivate-transfer-tofrom-rio-t368071/
We suggest that everyone arrives Thursday two days before the wedding. From America to Brazil, it is a total of 14 hours, depending where your connection is from. You want to fly out Wednesday and get to Brazil Thursday morning. If you plan to stay a week or more, we will have activities planned that we can do together after the wedding, or you can plan your own as there is plenty to see in the beautiful country of Brazil.
It is in the 80s, sunny with no rain! Plan for the beach during the day, and a light jacket in the night.