I grew up near Longwood Gardens-if you are unfamiliar this is one of the top botanical gardens in the U.S. located in Kennett Square. I think Phipps gives it a run for their money. Phipps is just the perfect size where you can easily walk around in 1-2 hours.  Great spot to take kids as they have an outdoor children's garden. Love going around the holidays to see the winter flower show and holiday decorations. They also have some really cool events including Night in the Tropics a +21 event on select Friday evenings with a DJ, beer and food for purchase.  In addition, I highly recommend the brunch! This really is the best kept secret in Pittsburgh. The brunch is $29 which includes tip and tax and admissions into Phipps. What a great deal! The food is fantastic-they have an omelet bar, carving station, dessert table and one table of breakfast food and one of lunch options.  The sticky bun French toast in amazing!