There might be a parish in Vegas where you can go to Mass as a means of Thanksgiving for your years of marriage. The ideal would be to invite Christ into your celebration, as I alluded to in my earlier post. Then, at the reception, you can certainly go at it with Elvis. The most important person in your marriage, though, is Christ. You can have all of the fun and the romance, but He is the glue that holds you and your spouse together.
Of course, if you want romance, you could have Elvis either at the Paris or the Venetian hotels. If you go the Venetian route, you could perhaps have him sing to you on the gondola.