I have found the Town Lake Hike and Bike trail to be one of the best places to work out and just spend time. So close to downtown it is convenient to get to and enjoy. I like parking at Zilker Park and running along Barton Springs to the Lake. The nice thing is, you can park in any number of places that are convenient to you and get access to the trail. There is also a nice dog run and park if you want to bring your dogs. Another great activity is to rent kayaks or canoes or stand up paddle boards. Prices are reasonable. I would not recommend the paddle boats as much as the other alternatives. They don't work as well and can be difficult to steer and control vs the more agile kayaks and canoes. If you have not tried the paddle boards, you should. It is not that hard to learn and really is a nice workout and enjoyable way to move around the Lake. By the way, there are no motor boats zooming by which helps to make this a really peaceful experience. The trail is almost all cinder track type running which I find to be very comfortable to run on. There are some slight inclines to give you some elevation and a good workout as you run. You can also run up to Congress and in a few blocks have a Starbucks after your run. There are some good running routes posted online giving you a choice of distances. Most involve crossing over bridges many of which are designed just for pedestrians. This just adds to the spectacular views of the city and the lake.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.