We are coming to USO,IOa, DC, Sw in March. I planned to do DC the 1st full day there and then Us, Sw, IOA, and maybe WEtNWild the last day. We'll also go to USO and IOA at night also. anyone think this is a good time to go or should we go to DC in the middle of trip?We plan to be there Sat-Fri so we'd be at DC on a Sunday when the parks are more crowded.