This is a popular place and rightly so with one of the most spectacular views in the Derbyshire peak district.There is a small pay and display short stay car park overlooking the Monsall trail with marked bays which is suitable for cars and only the smallest campers.At the rear of the Monsal Head hotel there is a larger long stay pay and display car park,unmarked bays,which would be more suitable for campervans.There is a weight restriction(but no height barrier)which precludes most motorhomes but I have seen quite a few coaches,minibuses and the odd motorhome/campervan parked in there so I don't think it is strictly enforced.
Be aware that in summer it gets extremely busy and both car parks are often full.