I love this idea. An envelope guest book. You just take a store-bought scrapbook/album and glue envelopes into it. Lay out colored pieces of paper for guests to jot notes down on, and then they can place them in the envelopes.
It doesn't have to be fancy like this but you need booze in the morning for the bridesmaids/groomsmen as they're getting ready. One or two bottles of bubbly is enough for the bridal party. Mimosa kits for bridesmaids in the morning
Something fun for guests to do at the table. What should we name our kids? What is the most romantic place we should visit? What is the best marriage advice you have ever received? What is your favorite memory of us? Where do you see us in 25 years?