If you're hoping to catch a glimpse of the newlyweds in the flesh, head directly to Windsor, Berkshire (extra trains will be running to and from town on the day of).
Food vendors, live entertainment, and massive screens showing the wedding will be set up near and around Windsor Castle, with footage of the ceremony airing in Long Walk and Alexandra Gardens. Once the couple have made their vows, the carriage processional will run along Castle Hill, High Street, Sheet Street, Kings Road, Albert Road and the Long Walk.
Camping anywhere along the route will not be permitted, but be sure to get there early (and maybe bring a folding chair?) if you'd like to get a good view.
Remember: The wedding is set to start at 12 p.m. sharp, with the carriage processional to follow about an hour later.
Royal Windsor Race Course is another great spot to mark the occasion. And if you're hoping to watch the royal wedding as well as the FA Cup final, book a ticket to the track's Outdoor Screening & FA Cup Party (starting at £5) as they'll be airing the events back-to-back, along with some live music and children's entertainment.