Join the Pagham Pram Race from 11am. The three-mile race is in its 65th year and takes place whatever the weather. It starts at the mill on Pagham Road, passing pubs along the way including The Bear, The Lamb and The Kings Beach, finishing at The Lamb car park.
Here's our pick of the top nine things to do in the area this Boxing Day (December 26).
Enjoy some Boxing Day racing at Fontwell Park. There's reindeers, an ice rink and festive food, as well as seven races.
The Boxing Day Concert at Eastbourne Bandstand is back, and it's free, from 11am to 12.30am.
Get your skates on! Brighton's ice rink with a beautiful backdrop is open on Boxing Day. There are also ice rinks in Worthing, Chichester, Crawley and Bognor Regis.
Join the Pagham Pram Race. The three-mile race is in its 65th year and takes place whatever the weather.
Visit Bodiam Castle in Robertsbridge, East Sussex with an exclusive Boxing Day tour from 9.30am to 11.30am.
There's plenty of panto to enjoy in Sussex this Boxing Day with Jack and the Beanstalk at Hastings and Brighton, Sleeping Beauty in Horsham and Cinderella at Eastbourne.
Shop the Boxing Day sales at your local high street.
Go for a walk. With so much stunning countryside in Sussex, there's plenty of public trails to explore.
Morris dancing is still a strong tradition in some parts of Sussex with perfromance in Findon, Burpham and Sompting.