Yes, I am sure your family will be fine with all of the flat rides and waterpark as stated above. If you wish to look at all the rides they have go to
http://www.miadventure.com/frame.htm and click on the ride info button. Schedule, prices, and other useful things can be found there also. Enjoy your trip...and if you see 2 girls on Shivering Timbers all day, that would be myself and ThrillSeeker, so say hi.
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Life is a roller coaster...enjoy the ride!