In the history of Canadian conservation, Parc National de la Jacques-Cartier (jacques-cartier.com; adult/child $8.78/free) is a heartwarming success story. The public rejected a dam project in this Edenic glacial valley, and today the 600-sq-km park attracts hundreds of thousands of hikers each year to its 100km of forest trails. These trails vary in terrain and difficulty, and some double as gravel-biking routes. L'Epéron is a steamy forest walk (5.5km) with lookouts giving views down the valley, while Les Loups (10km) and Du Hibou (13km) are two tough but rewarding trails.
In winter, snowshoers and cross-country skiers flock to Jacques Cartier to explore a snow-covered wonderland. The park is just off Rte 175 about 40km from Québec City. Although it's great for a quick escape, there's no need to rush: reserve one of 113 campsites or stay in one of the local chalets or yurts.
During the warmer months, canoes and kayaks drift down the (mostly) gentle waters of the Jacques Cartier River. If you're not bringing your own craft, you'll find a rental center (per hour canoe/solo kayak $19.50/17.75, per day life jacket $8.25) at kilometer 3 on the road that loops through the park. Looking for more action? There's a second rental center at kilometer 10 for whitewater rafting, with multiple circuits and shuttle transport.