Earlier quoted context omitted.
I agree 100% with the spirit of your point and I think imagining a forced bet scenario can help to clarify things. There are three main concepts we want to interpret within the context of the phrasing of the rule: (1) the intended referrent of 'vehicle'; (2) the intended meaning of 'in' the park; (3) the actual intention of the rule regarding emergency vehicles. This is the scenario: imagine you're forced to wager a…
I think you would lose a lot of money. Bikes and skateboards alone are going to have tons of violations. Also, I feel like if i had to bet money, boats aren't going to be included unless specified in most but crucially not all circumstances.
Personally my instinct is that I'd lose more money by specifying skateboards and bikes as I've usually seen those addressed by their own signs rather than being included under "vehicle".