Entrance is via the West door on King's Parade and the bells are accessed via a spiral staircase.
Parking is either a reasonable walk (half a mile or more), or nearby carpark but expensive - please research your best options on the web before the day, consider the Grand Arcade Car Park or Queen's Road across the river. Driving around the centre of Cambridge is almost impossible as there are many traffic restrictions. Park and ride is available but check the times of availability for your chosen venue.
There is a bike storage area outside the church, and various bus stops just a 5 minute walk away on St Andrew's Street.