Sirmione is a beautiful town located on the southern shore of Lake Garda in Italy. Here are some of the best things to do in Sirmione:

1. Scaligero Castle: This is a 13th-century castle that is one of the most popular attractions in Sirmione. It is located at the entrance to the old town and offers great views of the lake and the town.

2. Explore the Historic City Center: The city center of Sirmione is a maze of narrow streets that is a delight to explore. These streets are filled with cafes, shops, bars, and hotels. As you walk through town, don’t miss the Flower House, a small café that is blanketed with purple bougainvillea.

3. Step inside the Church of Santa Maria della Neve: This is a beautiful church located in the historic center of Sirmione. It is known for its stunning frescoes and beautiful architecture.

4. Cruise around the Sirmio Peninsula: If you want to explore the city center, take a boat trip around the peninsula, and visit Grotto de Cattulus and Jamaica Beach, you will need almost one full day. If you just explored the city center (skipping the sights on the north end of the peninsula) a half day is all you need.

5. Grotte di Catullo: These are the ruins of a Roman villa that dates back to the 1st century AD. The villa is located on the northern end of the Sirmio Peninsula and offers great views of the lake.

6. Jamaica Beach: This is a beautiful beach located on the northern end of the Sirmio Peninsula. It is a great place to relax and enjoy the sun.

7. Chiesa di San Pietro in Mavino: This is a beautiful church located on a hill overlooking the town of Sirmione. It is known for its beautiful frescoes and stunning views of the lake.

8. Lido delle Bionde Beach: This is another beautiful beach located on the southern shore of Lake Garda. It is a great place to relax and enjoy the sun.

9. A walk through the old town: The old town of Sirmione is a beautiful place to explore. It is filled with narrow streets, beautiful buildings, and stunning views of the lake.

10. Explore the tastes of Sirmione: Sirmione is known for its delicious food and wine. Be sure to try some of the local specialties, such as risotto alla pescatora, tortellini di Valeggio, and Lugana wine.

Overall, Sirmione is a beautiful town with plenty of things to see and do. Whether you want to explore the historic city center, relax on the beach, or enjoy some delicious food and wine, Sirmione has something for everyone.