Interestingly there's been a subtle change in the Standardised European Rules of the Air with respect to the (old) Rule 5 (low flying rule) in the UK Rules of the Air.
I've not got the precise rule in front of me but in relation to a congested area SERA states that in the even of engine failure you have to able to alight "safely" whereas the UK R of A stated you had to alight "clear of the congested area".
‘Congested area’ in relation to a city, town or settlement, means any area which is substantially used for residential, industrial, commercial or recreational purposes;
I guess a golf course might count as "recreational purposes".