Let them explore the world even if it is just in books. Let them live life to the fullest don't keep them locked away. Let her go out with her girlfriends for the night. Let her go listen to a band and dance and laugh. Let her enjoy life. Because when she comes home to you she will curl up to you and tell you all about her night. She will have a sparkle in her eyes that will last for days.
When she wants to take a drive at 2 am to look at the stars, take her. Watch the sparkle in her eyes as she just looks up and enjoys the view. When she wants to go to the book store just to look around, take her. Stand a few rows away and watch her get lost in all the isles.
Don't stop her from being spontaneous. Don't let the sparkle die out of her eyes. Because once she loses that sparkle she loses a part of herself.