Check out the stunning cathedral and enjoy the entertainment choices in this historical area while you're sightseeing. Those visiting St. Petersburg love the museums and cafes. These are some of the parks and outdoorsy places: Alexander Garden, Summer Garden, and New Holland Island. You'll find these family-friendly attractions: Planetarium 1, Cruiser Aurora, and C-189 Submarine Museum. Some historical places you might want to see include Alexander Column, State Hermitage Museum, and Admiralty Building.