Grab some pamphlets at Tallinn Traveller Info. This place will have all the info you need to make the most of your time in the area.
If you're on a budget, it's good to know that Tallinn Traveller Info costs nothing to visit. You'll find this tourist information center in the lakeside district of Old Town. Nearby sights to include in your travel plans are Alexander Nevsky Cathedral, St Marys Cathedral and Town Hall Square.