How busy is the Sandcastle Club usually? We plan on using it on 4/24/13 and I haven't had a chance to call and reserve a spot. Our kids used the Cub's Den in July and we had reserved a spot ahead of time and it probably wasn't neccessary because they were the only kids there that night!!! I will probably call to reserve this weekend if I get a chance but is it neccessary if I forget???