You should ask her to hang out, then walk to the most beautiful spot you can think of and ask her out.
In my town, there is a Holocaust Museum (sounds odd, bear with me) that has a path that takes about 10 minutes to walk through beautiful woods that opens up onto a small but nice beach. There's a long line of rocks that extends 40 or 50 feet out onto an old broken gazebo, but from there the sunset lies right on the water.
Only problem is that poor mexicans fish on the gazebo and clean the fish there, leaving an awful smell.