trip with my 5 year old- where should we go?

My husband and I have a few problems so I'm staying at a friend's place since about a week or maybe even longer and my 5 year old son was just super helpful- he didnt push me when I told him we won't go home yet and all. 
My 1 year old got sick so I couldnt spend that much time with my son but he was really understanding so my friend and I thought a little trip would be a cute little day off and I'd get my mind off of all my husbands drama. 
He LOVES fish and the movie finding Dory so he asked me if a "fish zoo" like that existed in Cali. If anyone knows that or anything similar or just some other cute idea please suggest something. 
LA + 30-mile radius.
Price etc doesnt matter.

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