My family is taking our first cruise on the Dream in April. We will be traveling with our 7 year old son. I want to send to the kids club so he can hang out with some kids his own age. My question is when is the best time to send him there? I don't want him missing anything really cool on the ship because he's there but I also want him to play. Any advice? Also, how do you sign up for it?. Thanks!