I love Texas anytime of year, but I recommend my family to come in late March, early April because everything starts "greenin' up" and blooming and there is still a nice breeze, windows can be left open. Golfing is good. If you can't make it then, come around September-October. Things are still green and lots of outdoor events going on. SXSW, Lake Travis activities, festivals and craft shows of all sorts, biking, running events. Golfing is good. You simply can't go wrong coming to Texas.