hang out at White Rock Lake. good times. and the weather is perfect.
check out Clyde Warren Park...really cool urban park in the downtown area.
the Ross Perot Museum of Nature and Science, just down the street from the Clyde Warren Park, is awesome.
the Dallas World Aquarium is great too,
at night...head over to Deep Ellum for some great music/happenings/food.
and a night at the Ballpark in Arlington watching the Rangers is awesome. especially before it gets hot.
and spend some quality time in the treehouse bar (seriously) at the Truck Yard. one of my favorite places in town.
http://www.yelp.com/biz/truck-yard-dallas