Sorry......but you don’t get to use the service elevator as a choice if you’re a preferred guest.
Actually, it depends on the resort and it depends on the preferred guest.
My friend saw numerous celebrities (preferred guests) in service elevators and employee corridors at the resort she worked at. Resort policy forbid employees from outwardly recognizing them or approaching them
Some celebrities value their privacy. Since they are wealthy, the resort accommodated them and let them use employee areas to avoid paparazzi, stares, and even well intentioned fans. Some such guests may never use employee areas, others probably used them routinely.
I"ll bet many resorts with celebrity guests allow them to use employee areas. Likewise, resorts may differ on who they define as a "celebrity". Some resorts may have an exacting definition, other resorts may have a broader definition to include: " relatively wealthy, high maintenance, self important people (comped whales)". SP would fit this definition.