On the St. Lawrence River
On the St. Lawrence riverfront, the Bonnie Castle Resort offers a pool, river frontage, a marina, and event facilities near Boldt Castle and the Thousand Islands boat tours. Best for travelers who want a riverfront resort base for the castles and the boating; the pool is the shared water feature, with a jetted-tub room a category to confirm at booking, and the mixed rating worth a read of recent reviews.