Welcome to Dreamviews!

SP is not part of lucid dreaming, nor does it happen more often then it would normally because of that. If you by any chance find yourself not able to move, you can use it to your advantage. Exactly the way you did it. Minus worrying about not being scared? I think you not being scared was excellent job. There is nothing to be scared off. Fear only hinders your experience.

Visualizing yourself someplace else is a way to go. Also, simply getting up from the bed by either standing up, or rolling out will get you out of your physical body. As soon as you do that, you realize you are dreaming and then you can change your dreamscape to the beach or anything else you like. Happy travels