The line is drawn in Chapter 2 of the 2010 ADA Standards for Accessible Design and respective chapter of the state building accessibility codes. Chapter 2 covers the scoping requirements for different types of facilities. Section 240.1 Exception 3. reads "Amusement attractions shall not be required to comply with 240." This scoping exception is repeated verbatim in California Building Standards Code 11B-240.1. For reference, new rides are covered under Section 234.
The US Access Board, in their
guides for recreational facilities, defines an "amusement attraction" as "any facility, or portion of a facility, located within an amusement park or theme park, that provides amusement without the use of an amusement device. Examples include, but are not limited to, fun houses, barrels, and other attractions without seats."