There is no surefire way to damp out the sounds of a swing party in a hotel room. Ckmate2020’s suggestion of getting a higher end room is primo. A few other things we’ve found that can help are:
1) Make sure the bed(s) and couch are far enough away from the wall that they won’t bang into the wall with every thrust.
2) Have some white noise going to interfere with the swing party sounds. Music Or TV (not blaring - that attracts a different kind of attention) helps.
3) Often there is a noticeable gap underneath the room door to the hallway. Put pillows or a blanket in that gap to minimize sound going through the gap.
Like we said - nothing is surefire but these might help.

