What's your opinion on feeding each other cake in a slightly ridiculous manner? I've been to several cousins' weddings and it comes off as cute if the couple are into it (one did a cake bite with each other followed by an immediate and very passionate kiss ), but if you're not into it, it will look silly.
On a more serious note, if you haven't already, I would suggest giving the officiant a chance to say a few words to the two of you privately (or quasi-privately with just the immediate wedding party). If the officiant is someone you respect, it will really stick with you, and I know that at my brother's wedding it ended up being one of his most memorable takeaways.
Edit: changed an apostrophe to avoid implying one cousin had several weddings.