Brugge is so small that everything is easy to reach on foot.
For dinner (in your price range) I would suggest Tom's Diner on West Gistelhof. It's a little bit off the beaten path (10 min. walk max.) which adds to the experience. The building is very typical old Flemish style and also inside it looks like in a previous era. The food is delicious and they have something for everyone. Very friendly staff. http://users.pandora.be/tom.s.diner.bvba2/
Another one that I like is Bistro De Pompe on Kleine St. Amandsstraat.
PS You can get a detailed city map at the tourist office for a few eurocents.