Take a break from sightseeing and indulge in the Roman pastime of thermal spring bathing. There are several spas around Sirmione but I think the best is Acquaria. It's quite new and in a beautiful setting right by the lake. As well as many smaller bathing pools of different temperatures and massage effects, there is a large natural water pool. Swim through the gateway to get to the outdoor pool. Evening is the best time to go as it's cheaper, less crowded and you can swim under the stars and gaze at the twinkling lights on the other side of the lake. We went in winter which was ideal - the hot waters keep you warm for hours afterwards. A word of warning - the water is sulfurous so the stench stays with you for days!
www.termedisirmione.com/tds/en/homepage/hotel/hotel-sirmione/aquaria-club.html
Terme di Sirmione S.p.A.
Piazza Virgilio, 1
25019 Colombare di Sirmione (BS)
+39 030 91681
Google map: bit.ly/Lomvuz