Lake Garda: rent a car or rely on public transportation?

Hey everyone, We’re flying into Venice and heading to Lake Garda, staying in Gargnano for 4 days. We’re debating whether it’s better to rent a car from Venice and keep it the whole time, or rely only on public transportation to get to and around Lake Garda.

We’re not sure how difficult parking is in/around Gargnano, or if having a car would be more of a hassle than a help. Is public transportation reliable enough for getting around the lake, or is a car worth it?

Any advice appreciated — thanks!