This is such a great idea! I love your ideas Stephanie! It's so relaxed and makes your wedding just like a vacation. Just mind the temperature outside at night if the groomsmen wear shorts! I also really like this idea Chelsea gave you for the bridesmaids. What did you have in mind for the bridesmaids dresses? Will they wear the same dress or mismatched?
That is a gorgeous ceremony location! It's going to be so beautiful for your wedding! Will the reception be outdoors or inside? Have you found bridesmaid dresses yet? I agree that linen pants would be perfect for the guys!
I'm also going more formal (but suits rather than tuxes). I have seen the more casual thing done, but really only for beach weddings. I feel like shorts is a bit too much (or little) IMHO, but some nice light linen pants can still feel "formal" while being more comfortable and casual. I also think that it depends on your venue for this one, shorts/linen pants feel very out of place in a ballroom/banquet hall type venue.