Brighton Seafront and Pier - www.brightonpier.co.uk
The Royal Pavilion - www.royalpavilion.org.uk - magnificent royal pleasure palace built for George, Prince Regent, at the turn of the 19th century.
Volks Electric Railway - www.volkselectricrailway.co.uk - claiming to be the world's oldest operating electric railway, it runs between Brighton Marina and the pier.
Historic Houses, Castles and Gardens
Nymans - The National Trust - www.nationaltrust.org.uk - 20th-century garden, set around a romantic house and ruins, in beautiful woodland
Borde Hill - www.bordehill.co.uk - garden, parkland and woodland
Wakehurst Place - www.kew.org/visit-wakehurst - Country estate with ornamental gardens, woodlands and Elizabethan mansion.
Lewes Castle - www.sussexpast.co.uk - Castle of Norman origin with an impressive 14th-century outer barbican gate.
Things to do with the kids
Sealife Centre - www.visitsealife.com - The oldest operating aquarium in the world housed in wonderful Victorian buildings on Brighton Seafront.
Lavender Line Steam Railway - www.lavender-line.co.uk
Bluebell Railway - The volunteer-run Bluebell Railway operates restored steam trains throughout the year on their 9-mile line, running through the Sussex Weald.
Ten Pin Bowling - www.bowlplex.co.uk
Drusillas - Drusillas Zoo and Family Fun Park.
Treasure Hunts - Black Cat Treasure Hunts have set up routes all over Sussex to help you have great fun exploring and discovering all the best and most interesting parts of the county whilst you are on holiday here. The treasure hunts can be printed off in advance or followed on a smartphone.
Sailing & power boating tuition - www.greenactivebreaks.co.uk - also based at Brighton Marina.
Power Boat & RIB Charter - www.fullthrottleboatcharters.com
Watersports - www.thebrightonwatersports.co.uk - including boat charter, wake boarding and waterskiing.
Scuba Diving - www.academyofscubadiving.co.uk & www.newhaven-scuba.co.uk
Walking on The South Downs - www.southdowns.gov.uk
There are a lot more ideas on the following sites:
"We had a wonderful week's holiday not least because of where we were staying."