Fairmount Park Race Track races horses every Tuesday. I would bring both a Standard Zoom lens ( Mine is a[masked] ) and a long Lens. They allow Tripods and Long Lenses. Racing starts at 1:00 Plan on being there at 12:15-12:30. Let's meet inside the front gate toward the track. Web Site : http://www.fairmountpark.com/
Cost ~$2.50 ( At the Gate ). Betting is up to you.