Located at the end of the San Antonio promenade, out past Kanya Sunset cafe and towards Cala Gracio, the Cap Blanc Aquarium is a popular and interesting attraction. Its part of an old smugglers cave that has been turned into an aquarium that houses endangered and protected species of Mediterranean marine life. Its also a rehabilitation center for recovering species of fish and is a popular family attraction, especially for the kids. Its open from 10am to 10pm during the summer season and 10am to 7pm off season. Entry fee is €3 and there are guided tours of the cave on Tuesday and Fridays between 10am and 2pm. It also has a lovely, relaxed non commercial bar/cafe which is an ideal place to watch sunset with just the sound of the waves lapping the shores.