We've attended a wedding at The Inn at Mill Falls. Beautiful!
They accommodated the light rain well with a large outdoor tent, the evening reception was indoors.
http://millfalls.com/conferences_events/index.htm
We've also watched a wedding while visiting The Castle in the Clouds.
They don't close the Castle, but do restrict the inner lawn to wedding guests.
You'll have an audience (no issues this day, we all quietly watched)...and spectacular views!
http://www.castleintheclouds.org/