Remember, you are on a tropical island. Don’t plan your trip too full of activities, but leave some time to relax, and enjoy the hotel pool, the beach, and the waves of the Indian Ocean. Many beach side resorts offer a private lounge for rent, and offer come with full service, and often you can even get a massage on the beach. Many beach front properties in Nusa Dua have wave breakers making swimming in the ocean safe and easy. If you are looking for surfing waves, book a hotel in Seminyak instead.
Photo from The W Hotel Bali in Seminyak, where you can surf the waves directly from the hotel's beachfront. There are also many public beaches if you are not staying at a beach resort.