you generally dont need to book, its so quiet you can just turn up in the pro shop, get a tee time and go out, other than friday mornings when they have the society from 8:30 through to 10 ish.
at the moment its 30€ for owners but i belive this is going up in October when the peak golf season starts. Twilight golf starts at 1pm, again this is 30€ and 15€ for a buggy...