Hi momof2! No, there are no restrictions for larger size on any of the rides other than some of the kid's attractions in Mickey's Toontown. The only other type of restrctions are minimum height requirements for some of the rides. Enjoy!
I went do disneyland as a size 20/22 and had no troubles at all. But at DCA I believe there is one of the rides (a swing ride) that has a weight limit of 200/250 lbs.
So I woudln't really worry about it, go and have a great time!!!
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