Let's ride the Zilker Zypher! It starts its first run at 10 am so let's meet at the station a little early.
The train runs on the hour (10 am – 6 pm) on weekdays and every 30-40 minutes on the weekends (10 am – 7 pm), weather permitting. The tickets for the train rides sell quickly, especially on the weekends. It is cash only according to what I found online. It is $2 for kids and adults are $3. I also read that kids under 1 are free.
This is the address listed for the train station:
2100 Barton Springs
, TX 78704