Our new favorite discovery - Urban Solace - starts a Bluegrass Sunday Brunch this week and they apparently serve until 5pm.
Another cool spot we recently tried for Sunday brunch was Lei Lounge on the north end of Park (at Adams). I wouldn't think a rainy day like today would be much fun but if the weather's nice, it's a great space. They have a dj spinning and cool cabanas outside....food was good and the champagne cocktails weren't too bad either. I believe they serve until 4pm.