Go for a short hike and enjoy the beautiful view of Colorado River from above the 360 bridge.
If you are feeling too hot, jump into the cold water of Barton Springs. You can also do some canoeing, paddle boarding, kayaking at Zilker Park or just enjoy a walk through the beautiful park in the middle of downtown Austin.
If it's in Texas, it must be bigger and better. That is the motto that architects followed with the Capitol Building in Austin. At one time, it was the tallest capitol building in the nation. Others might be taller now, but this is still a beautiful building that shows off many of the natural resources which are so prevalent in Texas, such as limestone and the landscapes.