Uluwatu is a dream for every expert surfer. All year round very good consistent waves with many different peaks and long powerful rides. If the waves are flat or very small everywhere else, slightly intermediate can also try to catch a wave at Uluwatu.
If the waves are big, its a show to watch all professionals surfing at Ulus. Grab a beer at one of the nice Warungs and enjoy the special atmosphere.
The beach at Uluwatu is very small and not very comfortable to relax. But if you go on mid to low tide down to the beach, you will find a small cave on the left side. Go trough that cave and you will find a 100m long white sandy beach to relax and swim. Be careful with the time to go back, as the water gets to high the cave is not walkable anymore.
But most of the guests are sitting in one of the many Warungs at the cliff. From there you have a beautiful view to the surfers and amazing sunsets.
Advice: Please always remember to not leave any expensive belongings at the beach. The most safe place on Bali is a local people who is selling food or drinks at his Warung (small Shop). Its like take and give. He will take care of your belongings and you can buy a drink or something to eat to support the locals. Please never leave your stuff inside the motorbike or unwatched at the beach.