It's a large cathedral with special architectural features. Wood stained ceilings with artwork etched on its surface. Stained glass windows. Huge tall ceilings and a real sense of peace - no matter what your religion is you should visit this cathedral. Most St Lucians are catholic so the church in each town is usually the biggest building in town.
Park in the parking deck by the water and walk 10 minutes - the streets are tight and packed.
Get out if the heat and rest a while in the cathedral - and if you need an ATM there is a bank across the road!