Due to Harvey Hurricane most of the trails were still muddy and down trees when I got there. I didn't get to ride the places I listed but the two I rode were worthwhile. I definitely would go back for the city, riding, and other recreational activities. I highly recommend it. Hopefully I can hit at least two above next time (IMBA epic Lake Georgetown for sure). Post on mtbr for tours or let me know and I'll get you in touch with the two that helped me. You will definitely need a lead.
Aside, food was great, beer was great! BBQ was mind blowing. Brisket melted in your mouth. I ate brisket 3 our of 4 days.
Day 1. Road ride - due to the muddy trails we had to road ride. Not ideal outside of the city (riding along big shoulders on state routes and tight shoulders elsewhere but we took are chances...) Riding through the city on the bike lanes and paths was a nice way to see the city.
Day 2. Pace Bend Park ($10 admission but well worth it) - techy and had a nice legit manmade park section. 40 min outside of downtown. Rented FSR B+ bikes from Bicycle Sport Shop. Perfect bike. Great shop, charged us for 24hr mtb rental for the road and B+ bike since our intention was only to ride mtb before Harvey.
Day 3. Walnut Creek Metro Park - blew my expectations. Started flowy nothing great. Then turned into beasts of berms and some tech here and there. There was this mega cool natural wall ride. Cool creek crossings riding along limestone. 10 miles north of downtown. We just rode our hardtails from Mellow Johnnys. Or you can catch a bus. There is a pump track/jump pakr but it was closed for maintenance.