Close doors quietly and infrequently. Talk quietly . This can be one of the most respectful things you can do. Ask before using someone else's scope, and do not adjust it unless given permission by the owner. It is OK and even encouraged to get yourself a peek through someone's spotting scope.
Many regulars enjoy turning people on to the benefits of high magnification.
Just be considerate, and don't assume a scope is there for you to use. Be conscious of where you stand and walk . Do not block others' view. Be careful not to bump tripods legs. You do not want to knock over someone's scope.