All amusement parks are not the same for poohs sized people

[AussieNSW]

Just a warning for others just because you got in the rides at Disneyland including space mountain and Californian screaming does not mean you will fit in rides at other parks.
Please do not take Disneyland as a gauge. We found out the hard way when we went to six flags and none of the roller coasters worked.

 

[Darkbeer1]

California is very strict with safety regulations. Rides that are basically the same have stricter limits than in other states.

SeaWorld is friendly, so is Knott's for the most part, there are a few attractions that have an issue, but many rides have a specific seat or two that are designed for larger folks. I would talk to an employee if you have questions. There are also test seats on some roller coasters at the entrance for the attraction.

Universal is also good, there are a few rides that have an issue, but all have a test seat near the entrance to check before you get in line.

SF Magic Mountain is known as "The Thrill Capital of the World", and does have a lot of older rides, and as mentioned, not the best if you are worried about fitting into the seat and safety restraints.