Austin is one of those cool cities where there are plenty of fun outdoor activities all year long. One of the coolest things to do in Austin right now is to try stand up paddling, aka SUP. There is even sunrise SUP yoga on Sunday mornings. There are several locations to rent a SUP board, but one of the coolest spots is the one close to Barton Springs, because then you can go swimming afterwards. The Colorado river is not going to be your playground for swimming -- the water is pretty nasty! But for SUP or kayaking, the river and the Lady Bird Lake are perfect!