The ferry will deposit you on the wharf at Oban within a few hundred meters from the center of the small village.
The Stewart Island i-SITE Visitor Information Centre is at 12 Elgin Terrace (tel. 03/219-1400; fax 03/219-1401; www.stewartisland.co.nz). It's open daily; summer hours are 9am to 7pm, and winter hours are 9:30am to 6:30pm. The Rakiura National Park Visitor Centre is in the DOC building on Main Road (tel. 03/219-0009; fax 03/219-0003; www.doc.govt.nz). All trampers must report here for walking-track and hut passes. The staff members here are extremely well informed about all aspects of tramping and exploring the island; since some of the tracks are challenging, it pays to ask their advice. Also take a look at the 4-minute tramping video, which gives you an idea of what you're in for. They're open daily in summer from 8am to 5pm, and in winter from 8:30am to 4:30pm (closed Dec 25).
There is no full banking service available on the island. Credit cards are accepted by most businesses, but foreign traveler's checks and cash can be difficult to change, so it pays to arrive with New Zealand dollars.