I took my 6 year old about a month ago. She just made it to 48" tall which meant she could go on most everything in the park and she was not too scared so it was great.
If you have someone to watch him who isn't planning on getting on at the same time as you, sure. Or if you plan on staying in the kiddie section. Other than that, if you want to enjoy yourself without worrying of who's watching the baby, don't take the 6yr old.
Not sure if you asked and answered your own queation, but there is a children's section of the park that a 6 year old would enjoy.
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