On the second day, visit the Royal Botanical Gardens, one of the largest botanical gardens in Canada. Explore the beautiful gardens, including the Rock Garden, the Arboretum, and the Mediterranean Garden. Enjoy a picnic lunch amidst the stunning natural surroundings. In the afternoon, head to Dundurn Castle, a National Historic Site. Take a guided tour of the castle and learn about its history and architecture. End the day with a relaxing walk along the waterfront trail, enjoying the scenic views of Lake Ontario.