In Verona, you can visit Juliet's House, Piazza Delle Erbe and Arena di Verona.
Scaliger Castle, Jamaica Beach, Sunset Boat Tours and a lot of Gelato and Pizza.
Although we didn't get a chance to visit all of the towns in Lake Garda, the most recommended are Limone sul Garda, Riva del Garda and Bardolino. Bardolino is around a 20 minute drive from the venue
You can easily get the train to Milan for the day from Peschiera del Garda > Milano or Desenzano del Garda > Milano in around 1 hour/1.5 hours via the Trainline App.