Good Lord, procon & singpilot both need to grow up. There are obviously appropriate, and inappropriate places to take a two year old. It's like people get on a BBS and completely lose the ability to think before they speak. I'm sure Michael is well aware of how his 2 year old behaves under certain circumstances, and is planning his destinations accordingly. I must have missed the part where he talked about taking his 2 year old to the theater.
Interesting that the ones who so quickly put him on blast don't even sign their posts w/ an actual name.
Anyways, I think your on the right track w/ the cable cars and Pier 39, Fisherman's Wharf, Ghiardelli square are also good places to check out while your down near the water. If your into nature type destinations, Muir Woods (just on the other side of the GG bridge) is an awesome place, with flat easy walking trails. Teddy Roosevelt made it a national monument back in 1908. Here is a pic I took last time I went
Have fun!