I love taking my daughter here. She is 2, and I have taken her here about 4 times, since she was a baby! I will say we get in free because I am a CCSD teacher and they have special days where I get in with my ID. 4 and under are free anyways. The aquarium isn't huge or your typical big city aquarium. I would say you could experience the whole aquarium in 30 minutes - an hour.