Remains of Roman buildings (foundations) excavated in 1981. There are not much to see there, but it's free
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Originally it was a 16th century fortress which is now a walled historical centre of the town. It's listed on the UNESCO World Heritage List.
Garrison Headquarters
Palazzina with other buildings of this small island form a military core of the Austrian fortress. There is a relatively quiet atmosphere around there compared to the touristy civic centre of the town.
Which connects the old centre with one of the town's beaches.
Take a bike ride along the former towpath of the river Mincio, connecting Peschiera with Mantua.
A big theme park is located in the south of the lake.