For an evening of gambling, head to the Le Casino Barrière, 2 chaussée du Sillon (tel. 02-99-40-64-00). You can also order dinner, sometimes accompanied by live music. Presentation of a passport is required.
For dancing, consider L'Escalier, La Buzardière (tel. 02-99-81-65-56), open Thursday through Saturday from midnight to 5am. The cover doesn't exceed 13€ ($19). You'll need a car or taxi -- the club is in the countryside, 5km (3 miles) east of town. A disco, Le 109, 3 rue des Cordiers (tel. 02-99-56-81-09), is in a vaulted cellar that's at least 300 years old. It isn't as fashionable as L'Escalier, but it's accessible without a car. It's open Tuesday through Sunday 8pm to 3am, charging a cover of 10€ ($15) after midnight, including a first drink.
On weekends, and in search of nightlife, many young Bretons head for Rennes, but if you're interested in seeing the town's biggest disco, check out Le Klub, at L'Etanchet, just outside the hamlet of Pleurtuit (tel. 02-99-88-81-17). Housed in an isolated farmhouse on the outskirts of St-Malo, it contains a bar, a dance floor, and a revolving series of lights that evoke a 1980s disco. It's open Thursday, Friday, and Saturday nights, and on the evening before national holidays. Cover is 11€ ($16) and includes the first drink.
Popular bars include L'Aviso, 12 rue du Point du Jour (tel. 02-99-40-99-08), which specializes in beers from everywhere. Pub Saint Patrick, 24 rue Sainte-Barbe (tel. 02-99-56-66-90), offers 50 different Irish whiskeys along with brew from Brittany. It regularly schedules concerts. Also appealing is La Caravelle, 95 bd. De Rochebonne (tel. 02-99-56-39-83), a piano bar, 2km (1 1/4 miles) east of St-Malo, with a fine view of the sea.