Weekend shifts - Friday, Saturday, and Sunday RN Castle Benefits: Evening Shift Differential: $2/hour Night Shift Differential: $6/hour Weekend Shift Differential: $1/hour No Parking Fees Located in Kailua, Castle has been one of the area's leading healthcare providers since 1963. We are comprised of a 160-bed hospital, eight medical offices, home care services, urgent cares and a vast scope of services located throughout O'ahu.