The rental of this boat is possible only with a skipper.
1 hour CHF 300 gas included
3 hours CHF 650 gas excluded (10:00-13:00 or 14:00-17:00)
1 day CHF 1050 gas excluded (9:30-18:00)
Your skipper will show you the best sights and bring you to the best restaurants. It is possible to visit a island or maybe a italian market, or stop on a beach for a swimmbreak.
To get to the Borromee islands, you need about 1 1/4 hour. So in one hour you get about to Verbania.
There is a public parking next to asconautica, you can also find a parking garage at the local store Migros (about 5 min walk). As a alternativ you could go get free parking at the bagno pubblico (about 8 min walk).