k, so here's the plan. Find a state park, bike to it, take only a sleeping bag and cliff bars, camp out for a day or two. Next step find people who want to come...Also would this be better to do in hot or cold weather.
Enchanted Rock (83 mi)
Bastrop State Park (35.8 mi)
..or Buescher State park (44.3 mi)
Pedernales Falls State Park (48.8 mi)
Blanco State Park (56.1 mi)
Guadalupe River State Park (82.5 mi)