Child's Glacier is certainly Alaska's most spectacular roadside glacier--it's the only one where you can see calving. And when the calving is active in high summer, you'll see a major event every 15 minutes. Some of these collapsing icebergs are so large, they send a 10-foot wave rocketing across the river and crashing onto the opposite shore. Look for salmon splashed into the forest!
If you're standing anywhere near the shore when this happens, you will get washed into the river. That's why they've built a viewing platform--and why you should use it. Child's Glacier is 400 yards across the river from the viewing platform, so you can't walk up to it like you can Exit, Byron, or Matanuska Glaciers.
Cordova is an hour flight from Anchorage. Then, it's a 1 hr drive to the glacier.
190 miles east of Anchorage
If you visit Cordova, make a day out of exploring the Copper River Highway (which ends at the glacier), Child's Glacier itself, and the nearby Million Dollar Bridge.