San Francisco Ca: Where is the BEST and COOLETS place to take my 28 months old boy in San Francisco Ca?

He may enjoy the Zeum although it may be a little old for him. They also have an indoor carousel in front. http://zeum.com/

Randall Museum is free admission

The Randall Museum offers a unique haven where children and adults can explore the creative aspects of art and science and make discoveries about nature and the environment by direct participation in classes, workshops, special events, and clubs.

http://www.randallmuseum.org/HOME/tabid/36/Default...

Have lunch at the Rainforest Cafe at Fisherman's Wharf

Take him to see the aquarium (admission fee) and sea lions (no admission) at Pier 39

The Exporatorium is a really cool place but he may be too young: http://www.exploratorium.edu/

Take a walk in Golden Gate Park on Sunday

Jade of course is right but you might consider the zoo. You might enjoy carting him around there.

take him to a giants game

honestly, i doubt he'd care at that age