Several trains a day run on the scenic West Highland Railway from Glasgow Queen Street Station to Fort William. These trains usually split at Crianlarich, with one section going to Oban and one to Mallaig - thus they may be announced as destined for Oban, but part of the train will actually get you to Mallaig. Make sure you are sitting in the right section!
The route take you through spectacular mountainous scenery, offering some of the best views of Scotland that you can enjoy without actually having to do any hiking. Trains cross the remote Rannoch Moor, and north of Fort William, the line crosses the spectacular Glenfinnan Viaduct, a hundred-year-old stone arched rail bridge which was brought to fame in the Harry Potter movies (the bridge also features on the Bank of Scotland £10 note). Sit on the left of the train for the best views.
In summer, the West Coast Railway company runs a special steam train service along this line to Mallaig, which is popular with tourists and day-trippers, esepecially due to the associations with the Harry Potter franchise.
Caledonian MacBrayne ("CalMac") run most of the Scottish ferries, with more running in summer than winter.
Mallaig is a small village, everything is within walking distance.
Mallaig Heritage Centre located next to the train station tells the story of Mallaig and the surrounding area.
Mallaig has a few souvenir shops, two pubs, a tourist information centre and Spar and Co-op supermarkets. There is also a post office, chemist shop and ships chandlers.
In the middle of the village is the Fishmarket Restaurant serving fresh fish and some non-fish dishes. Very nice food. Alternatively, the Chlachain Inn does very nice food at reasonable prices. Their chips are great! Also, there are many other fish restaurants and other places to eat in the village.
There are many places to stay in Mallaig, though some are only open in the peak summer months.