Cruise Wedding and Group Vow Renewal

Hi everyone, I am in the midst of planning a cruise destination wedding and I am planning to do a less traditional ceremony. My wedding theme is “happily ever after.” And my hope is for all parts of our moment to be reflect and filled with love. My intent is to have a short exchange of vows for myself and my better half. Followed by a vow renewal for the couple in attendance who desire to renew their vows followed by a prayer for the group. So far I anticipate it being six other couples. All guest are expected to wear white for the females and black for the men. If any one has experience or found articles or videos with theme do tell. Also if you had a cruise wedding and can speak to the flexibility of the ceremony please share.