Depends if you like climbing as well as descending. If you like only the latter there are plenty of companies specializing in uplift tours. If you like climbing there is a well used trail starting from Riva and heading out along the other side of the lake from Torbole. It starts at the side of the first road tunnel and heads up to Lago di Ledro where there are a few way armed MTB trails. Or Malcesine has a cable car onto Monte Baldo and there are a few DH routes b ack down to the lake. Another popular route is Monte Tremalzo which is usually an uplift and a ride back to Riva. This gives you an idea of the type of riding.
Have a look for Luca bike shuttle who is based in Torbole although I think he posted on FB the other day that it might be the last uplift of the season. There is some snow in places there already.
All sorts of riding there depending on what you like although they’re not always easy to follow. If you go the the tourist info at the port in Riva, they’ll sell you a trail map for 4euros.
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