Take in the grandeur of St. Sophia Cathedral. Schedule in a mass if you can or just wander around and appreciate a break from the outside world.
When you've spent a bit of time at this Tobolsk principal church, why not make your way to Tobolsk State Historical and Architectural Museum, Tyuremny Zamok, and Tobolsk Drama Theater? They're not far from St. Sophia Cathedral and also a hit with tourists.