nana2tots - we're going to go on the day we arrive (a Sun) and just use our MCMCP tickets to enter the park at 4 - that way we're not also using a park pass that day - maybe that would make it a little more 'economical' for you with 6 to pay for. If you can't do it the day you arrive, maybe you could do it on another 'non-park' day and spend the day at the pool or a waterpark.
Since this trip is for 2 aunties to spoil rotten a favorite nephew (leaving our own big kids behind!), we're going to go twice !!