Congratulations! I've actually heard very good things about the RIU in Ocho, most recently from a friend that was there in June. She said they saw a wedding and it looked gorgeous. I have also been to Ocho, three years ago, and the biggest thing I remember that might be helpful is that the ride to the resorts was pretty long. It might be worth considering a private transfer so that you don't have a ton of people and have to stop at every hotel along the way.