more the merrier Matt, as long as they are not armed with BB guns, load music at 2am or revving a car for no reason whatsoever at stupid o'clock unlike some of the others we have had camping by us over the years, then sure it will be all good
Tent is the popular option, there are static caravans on site that can be rented or there is the option of a hotel or b&b somewhere nearby if they still have room