You have complete freedom to choose your venue. Many Renewal of Vows ceremonies are held in hotels, village halls, barns or even at home. Some couples choose to treat a Renewal of Vows ceremony as a repeat of their wedding day and others choose to have something completely different.
The choice of setting is entirely yours with this type of ceremony as a Celebrant is not restricted in any way by location. The only limitation is your own imagination, so why not have something out of the ordinary? Its your special day and it should be exactly as you envisage it.