Explore the medieval Old Town of Tallinn, a UNESCO World Heritage site. Visit the Tallinn Town Hall Square and see the oldest continuously functioning pharmacy in Europe at the Müller Pharmacy. Take a stroll along the City Wall and climb up to the Toompea Hill, where you can find the Alexander Nevsky Cathedral and the Estonian Parliament.
Visit the Kadriorg Park, a beautiful park designed by Peter the Great, and see the Kadriorg Palace, the former summer residence of the Russian tsars. Next, head to the KUMU Art Museum, where you can see a collection of Estonian art from the 18th century to the present day, as well as international exhibitions.
Explore the Telliskivi Creative City, a hip area filled with street art, independent shops, and restaurants. Then, head to the Seaplane Harbour, a maritime museum housed in a seaplane hangar. See different types of ships and submarines, and learn about Estonia's maritime history.
If you have extra time, consider visiting the Tallinn TV Tower for panoramic views of the city or taking a day trip to the Lahemaa National Park to see Estonia's natural beauty. If you have less time, you can skip the KUMU Art Museum or the Seaplane Harbour, depending on your interests.