Copán is a small community, so don't worry about mapping sights before you get there. If you are a walker and sure-footed, it is safe to walk the cobblestone streets anywhere in town or walk to the ruins on foot. Streets are reportedly safe after dark, but standard precautions apply.
Mototaxis Honduran rickshaws will take you anywhere in town for a small fee L10 around town, L20 to the Ruins/Macaw Mountain.
The Mayan Ruins are a short walk out of town and a further 20 minutes walk will take you to Las Sepulturas, a wonderfully open section of the ruins that many people fail to visit - don't! There is also a short nature walk at the main ruins that meanders around other smaller ruins.