Traffic generally is quite light in St Vincent and the Grenadines and so you’ll generally find easy parking. There are few restrictions on parking and you are mostly left to use common sense when parking.
Almost all parking is free until you get close to amenities or tourist attractions at which enterprising locals charge to park. The benefit is that your car will be monitored although crime isn’t high in the islands.
The police are good at enforcing traffic regulations and parking is no exception. If you park inconsiderately or obstruct others then you’re likely to get ticketed or towed.
There are no concessions for disabled drivers enshrined in law but finding a convenient parking spot isn’t usually difficult. In the event of a problem, just ask a local for help and you’ll often find that a convenient parking place is found.