Have a lakeside picnic
The town has two public accesses to the shore of the lake of two mountains: sandy beach in the centre of town and thompson park near finnegan's market. bring mosquito repellant. the best time to do this is labour day weekend, when the lake fills with sailboats for an annual regatta.
Watch a play
At hudson village theatre. located in hudson's historic train station, just behind the chateau du lac, most of its shows run in the summer. it features a variety of travelling companies as well as local productions. occasionally, dedicated trains from montreal take ticketholders directly to the theatre for a show. (http://www.hudsonvillaget...)