How to best access several thousand Euro to pay private tours in sorrento

Welcome to the forum!

Using a bank ATM
You will probably have to do several withdrawals over a few days
Check on your daily limit and have your bank increase it if possible

Well you don’t. You contract people and companies that take cards. Nobody wants to walk around with thousands of Euros in their pocket.

Aldo Limos, which we used last spring, accepted USD, with a fare exchange rate, and provided a written receipt. The service was excellent.

I believe that Italian law now requires businesses to accept credit cards if the exchange is above around 60 euros. It's been discussed here frequently. Have a great trip.

https://community.ricksteves.com/travel-forum/italy/private-driver-wants-us-to-pay-in-cash