Find a seashell , make sure you get all the sand and debris from it first (wouldn't want to scratch the ring!! :-) ), place the ring in your hand under the seahell, bring it to show her and when she picks it up from your hand to look, she'll see the ring underneath!!!! The rest after that is up to you!!
Thought that might be a cute idea--hope it all goes great and you have a happy, healthy and wonderful life together!! Congratulations and best wishes to you both!! Enjoy your stay, we'll be there the first week of December (maybe we'll run in to you!!) Would love to know how it goes!!!
Eva and Wayne