Port William Beach offers relatively sheltered swimming conditions compared to more exposed Stewart Island coastlines, thanks to its position in a protected northern bay. However, water temperatures remain cold year-round at 8-14°C, so wetsuits are strongly recommended. The beach's remote location means emergency services are not readily accessible, so swimming should be approached cautiously. Always swim with others and stay aware of changing tides and currents. The sheltered nature of the bay makes it safer than open coast locations, but conditions can still be challenging for unprepared swimmers.

Port William Beach is best visited during summer months from December to February when weather is most favorable and daylight hours are longest. This timing is especially important since reaching the beach requires either hiking or boat access, activities best undertaken in good conditions. Stewart Island experiences fewer crowds year-round compared to mainland New Zealand, so you'll likely find solitude whenever you visit. Weather can be unpredictable any time of year, so pack layers and rain gear. Shoulder seasons can be beautiful but require more flexibility with weather-dependent travel plans.

Port William Beach can be reached by two main methods: hiking or boat. The walking track from Oban takes several hours through native forest and is part of the North West Circuit Track. This is a proper tramping route requiring fitness and preparation. Alternatively, water taxis from Oban can transport visitors directly to the bay, significantly reducing travel time. Boat access depends on weather and sea conditions. Whichever method you choose, inform someone of your plans and carry appropriate gear including food, water, and warm clothing for changeable Stewart Island conditions.

Port William has a Department of Conservation hut used by trampers on the North West Circuit Track, which requires advance booking. This basic hut provides shelter but limited amenities—bring your own sleeping bag, food, and cooking equipment. There are no shops, cafes, or commercial lodging at Port William itself. Most visitors base themselves in Oban and visit Port William as a day trip via water taxi or stay overnight in the hut as part of a multi-day tramp. Pack all food and supplies from Oban, as nothing is available at the beach.

Port William Beach is distinguished by its classic Rakiura bay setting, offering a sheltered sandy beach surrounded by native forest in a pristine wilderness environment. The combination of access options—either a rewarding hike through untouched bush or a scenic boat journey—makes it more of an adventure destination than a casual beach visit. The bay's historical significance as a safe anchorage and its position on the North West Circuit Track give it special status among New Zealand's remote coastal destinations. It exemplifies Stewart Island's wild beauty and relative isolation from modern development.