West of Austin more hills:
from 620/Anderson mill out Anderson Mill: Lime creek road, 1431, out to Marble Falls, up 281 to Park 4 towards Llano connecting to 29. Then to Coopers BBQ in Llano. South on 16, Willow Loop, Get to Fredricksburg and back raod into Luckenbach. you can split 2 ways, one West to Kerrville and the Twisted Sisters (335, 336, 337). East Go 1623 or 1888 down to Blanco. You can go South to Devil's Backbone go up to Wimberly and then twisted roads back to 1826. Lot's of turns.
East of Austin, more level but there are some great twisted back roads:
112 out of Taylor to Lexington, work your way to College Station for lunch. south on 6 to Navasota and theEast on 105. Go to Brenahm for Ice Cream or the small side road 78, 57, 48 & 49 around the North side. Skip down to 71 via fm 448 and go West. Take Park 1C north just out of Smithville to Bastrop.
Is that enough road for 2 days? And don't forget the painted Church ride of Central Texas.