My advice is to stay at SDC for the day! You're going on a weekend and both parks will be crowded, so why waste time going back and forth? The others are right about dealing with traffic, trams, lines, etc. SDC has enough water rides to keep them wet, good food choices, the Stunt Dog show was good (it surprised me!), the Globetrotters might still be there, and there are concerts at Echo Hollow Fri. - Sun. night (Fri. -Lovin Spoonful) and (Sat. - Poco) and (Sun. - Rare Earth). Music may not be their first choice being young, but I saw many kids there for Spinners and Association last weekend, and all seemed to be enjoying it.