If you only have 2-3 hours to spend in Camden, London, there are several things you can do:
1. Visit Camden Market: This bustling market is one of the most iconic destinations in Camden. You'll find everything from vintage clothing and souvenir shops to artisanal food and craft stalls. Allow at least an hour to wander around and sample some of the food.
2. Explore the canals: Take a stroll along the lovely Regent's Canal that winds its way through Camden. You can watch the boats go by and enjoy the charming scenery. This walk should take about 30 minutes.
3. Visit the Roundhouse: This historic venue is famous for its architecture and live performances. Check out what's on and catch a show if you can. Visiting the Roundhouse shouldn't take more than an hour.
4. See street art: Camden is also known for its vibrant street art scene. Wander around the streets and alleys to admire some of the incredible graffiti. You should allow at least an hour for this.
Overall, you could easily do two or three of these activities in 2-3 hours, depending on your interests.