To all:
Riding the "twisted sisters" is a great ride. Leaving from downtown SAT is an all day (but well worth it ride). Plus, March is great riding, not to hot and cool.
On another day, you should go to Willow City loop, March might be a little early for the "famous wild flowers". After Willow City head up to Coopers for what may be the best BBQ in Texas. The head over to 2323 fro Llano down to Fredericksburg for some old fashioned German beer etc. Then down to Luckenbach, Sisterdale Boerne and back to SAT. This is another full day on the bike but very worth it.
If that's out of the question, then ride up to New Braunfels for the new Coopers (yes it is owned by the same family) and yes it is just as good.
Another great ride is to head to the Kerrville area and ride the many Rivers that are flowing. Cypress Creek, the headwaters of the Guadalupe etc.
March, April, October and November are my favorite months to ride in the area.
Enjoy. That's my spring break week and thus I will be in Utah on the white stuff or I would offer to join you.