The Access Code says:
Wherever possible, provide paths around or across the course and/or advise people on the safest ways through the course. This will help to minimise safety risks.
In winter, many people enjoy activities like sledging and cross-country skiing on golf courses. This can be important to local communities. These activities rarely cause any problems if done responsibly - by keeping off greens, tees and bunkers - and when there is sufficient snow cover. Golf course managers are encouraged to accept such access when it is carried out responsibly.