If you're spending a night in Picton or need somewhere to stay pre/post-ferry trip, Parklands Marina Holiday Park in Waikawa Bay is the place for you! It's perfectly located close ot the town centre and a great spot to spend a night.
You have easy access to Queen Charlotte Sound for boating and hiking, as well as all the on-site facilities you could need, such as hot showers, a kitchen, a pool, BBQ areas, and free Wi-Fi. If you're looking for something to do near the campsite, I recommend the Snout Track Loop, which is only a few minutes' drive away and gives you incredible views across the sounds!