The Access Code says:
You can only exercise access rights to cross over a golf course and in doing so, you must keep off golf greens at all times and not interfere with any golf games or damage the playing surface. Golf courses are intensively used and managed, and there can be hazards such as where golfers are playing 'blind' shots. In exercising access rights:
To avoid damaging the playing surface, cyclists and horse-riders need to keep to paths at all times and not on any other part of a golf course. When fertilisers or pesticides have been used, the duration of any hazard depends on the material used but should not normally extend more than a few days. Golf course managers can ask you to avoid using particular routes at these times. Following such advice can greatly help to minimise risks to safety.