Cute girl offered me a ride home. I said "Nah, I'm good" and walked.

I did that once. I said no because I had my bike chained up outside. In retrospect I realized I totally missed the fact she was trying to give me a chance to make a move. Never got another chance. Never turn down rides from hot chicks. You can go back for your shit later, you rarely get a second chance with the chick.