We just got back last weekend. It's ok in the daytime, just head back to your hotel before dark. You have to see the American museum of science and history. There's a hayden planetarium in it also; pay the extra quid to see it. I really dug the aztec and mayan stone sculptures & carvings. The t-rex, wooly mammoth, and bronto were cool too. The place takes up several city blocks and is impossible to see all in one day. Oh yeah, there's a 2 story inside open area that has a whale hanging from the ceiling to the 1st floor, really impressive.