Requesting recommendations for tourist attractions in Changwon from residents or visitors

‌Hello,
I will be visiting Changwon for a day trip next month for a wedding,
and since I'll be there, I'd like to do some sightseeing. From my research,
it seems there is Changwon's House, Garosu-gil, and a large tree worth 30 billion won,
but are there any other places worth visiting besides these three?
I expect to have about 3 hours after the wedding before I catch my train.