Hello I went out a few days ago and had a great night, and pinpointed a thing to improve for next time.

At one point, I stood outside kissing and having fun with a girl for an hour or so. Her friends quickly left us alone after seeing that she was really interested in me. She was sleeping at a friend's later, so the only opportunities were a park nearby or an alley (club not near my town at all so will probably never meet her again, number close isn't really an option..). How the fuck do I proceed at a point like this where everything is going great with escalation. In this situation, I wish I would have lead her on a walk in the park and fucked there, but here the question arises: how the hell would I ask/convince her to come with me into a dark park or alley at night? Should I use some form of "excuse", as when pulling back to my or her place normally and which would fit the situation?

Thanks in advance