Bridge building

Hey guys.

I have made a unity map and I was wondering if any of you guys could point me in the right direction of making a bridge to g over a lake and how could I let users be able to wal on it;)

You need to use a modelling program to make a bridge model. You import this model into unity and place it where you want. I won’t explain how to do that, but I can recommend you look into blender and some blender tutorials. Blender is free and quite powerful.