Ask your girlfriend to go on a walk on the beach with you. Assuming all the preparation has been done, go walk with your love. Notice the bottle top sticking up and have her help you dig it up. Let her open the bottle and read your proposal. Then get down on one knee with the ring and ask her to marry you. Know that you created a wonderful moment to remember together. She will have the bottle and parchment to highlight this special day in your lives.