A few years ago, the National Aquarium got a major face-lift and improvements are ongoing. It's not Sea World or the Baltimore Aquarium, but this is a pretty spiffy attempt for Cuba. A variety of tanks and pools re-create all the major water habitats of Cuba, and sea lion and dolphin shows are presented throughout the day. There are a couple of simple cafeteria-style restaurants, and one pseudo-fancy option, the Gran Azul Restaurant, with a huge Plexiglas wall opening onto a large tank where two sad and claustrophobic dolphins swim. This place is very popular with Cuban families and school groups, so it's a great place to mingle.