Yes, the gazebo is two layers. How many guests will you have? That will determine if you'll all fit.
The bridesmaids/groomsmen shouldn't be a problem, as they'll stand in the upper gazebo along with you and your bride.
However, just as an FYI, standing INSIDE of the gazebo you won't get the beautiful blue sea behind you in your photos. Del Sol did an amazing post on this forum to help brides and grooms understand the technical side of photographing in gazebos.
It's for a different resort, however the same logic applies.