Grand Case is diverse. You have water to swim, uncrowded beach to stroll, beautiful view of British island Anguilla and Creole Rock off shore., shops & restaurants to break up beach time. Worth doing but as others have posted, if beach is the main thing there are others to try: Baie Rouge Friars for example but limited beach foods and no shops. Or Dreams in Nettle Bay. Beautiful setting, great food but not a good swim area.
One day on every trip if we're not staying at Grand Case Beach Club, we spend time on the beach, have lunch, stroll. A lilttle quiet fishing village during the day and lively in the evening with restaurants & some music.
PS there's a perfumer in Grand Case. You can have a blend made just for you and you can see production. We always bring our first visit guests there. They have a nice line of sun care products too.