Guided tours are available by boat and tourist train during the summer; and audio guides can be rented at the Office de Tourisme (Place de la Premiyre Armee Francaise).
There are multiple boat tours conducted each day during the summer months. 
mnli hypothesis: There are multiple boat tours conducted each day during the summer months.  premise: Guided tours are available by boat and tourist train during the summer; and audio guides can be rented at the Office de Tourisme (Place de la Premiyre Armee Francaise).