The "beach" at Brighton is a must. If you're an American and you're used to white sand beaches, well... Get Over It! It's a bit rocky, but no more so than the island of Capri.
You'll also want to see the magnificent Royal Pavilions, which close early, then the famous Brighton Pier for thrill rides, games of chance and great junk food.
Quick Tips:
As soon as you get to Brighton, pick up some brochures and find out what concerts, plays, etc. are scheduled. Then, you'll want to plan your evening entertainment a.s.a.p., so you're not disapointed.
Best Way To Get Around:
Find a legal place to park your car for the length of your stay - then leave it there and walk. Parking can be very difficult. You don't want to park illegally, and come out and find your car has been "booted," or worse , towed!