Start by building some thrill and gentle rides along the bridge. The Wooden Roller Coaster is very expensive, so you should consider concentrating your research on Roller Coasters in the beginning. Both the Bobsled Roller Coaster and the Steel Wild Mouse Roller Coaster will then be researched very soon. Just use the Water Slide as a substitute until then. Make sure to build rides close enough to the bridge so they attract the attention.