Depends on what you mean by "see". How old are the kids? Sounds like you are talking about a weekend, so there will be peak tourist activity and lines can be long. CityPass and Explorer both have their own ticket lines at many of these attractions, but those could still be long since many others will also probably be using them. You can view the Statue of Liberty from Battery Park, but if you want to go out to the statue, it will be a MINIMUM of 2 hours. If you want to go up into the crown (seperate ticket required than what's included with your City or Explorer pass), it will be longer. If you are planning a tour of Radio City, they schedule them for about an hour. The Empire State Building is very popular and will have long lines. CityPass bypasses the regular line - sort of - once you are inside they have their own, but they limit the number of people who can be inside so it can take some time to reach the inside. You could easily spend the better part of a day at the Met as well.
Having said all that, the CityPass gives you a shot at seeing the things on your list for a pretty good price, even if you can't squeeze them all in. The Explorer pass you build a la carte, so I don't know where that is pricing out for your itinerary. I usually find them both to be pretty good values, even if your itinerary is a little ambitious for the time you have. (Think taking a drink of water from a firehose). NYC is always somewhat like that anyway. It's a great city with so much to see that it's always necessary to return anyway, so just enjoy it and see what you can.