Duct tape them to the coat-rod and get some much needed rest?
1 & 3 is hard. Camelot Golfland would be fun for an older kid. If your 3 yo GS "plays older" he may enjoy it. My kid didn't enjoy it at 3.
La Habra children's museum is a short drive north.
But in all candor, my experience with babies and toddlers is that nothing beats a day at the resort pool, especially if yours is heated and has a wading pool or zone.