I recommend attending Sunday morning mass. The interior domes are lit up and beautiful. It's a chance to relax and sit in the nave and take in the Church without being herded through. Sit in the center of the nave or closer to the front doors in order to look up and see the mosaics well. To enter for mass, you face the front facade of San Marco. Then, walk to the left side of the building. Enter through the side entrance. Say, "Messe". Which means mass. Pronounced may - say. Only daypacks carried under the arm are allowed or similar smaller bags/purses. Large bags have to be checked for free across the walkway. Venice is great for wandering. Impronta Cafe is a fine place to eat for excellent pasta and wine. Modern decor, clean. You can tripadvisor it.