Hello, we will be spending December 28 - January 4 in San Diego. "We" are two families of four with two girls (5&8) and two boys (8&10). We would like to hit the zoo, Sea World, possibly LegoLand while we are there. I'm a bit nervous about crowds. We have been to SD many times, but usually when school is in session. Should we expect horrendous crowds at the parks? Is there any particular park that would be better for Dec 31 or Jan 1? Thanks for any advice.