Yes, your children should meet other kids there age. Make sure you attend the "meet & greet" with the Counselors. You will receive a news letter every day either under your door, or in your mail slot. The time and location will be listed on the news letter.
I hope you enjoy your cruise as much as my family has enjoyed ours. The Inspiration is a pretty ship. I did a ship inspection on her. The food was excellent. I often go to the port and watch the Inspiration move out to sea. It never ceases to amaze me how something that large could change directions and float away with ease.