-- Last Updated: Jan-28-13 7:06 PM EST --
This is what I'd likely "try" to do...........
Day one: Put in at Cedar Grove. Try to be on the river no later than 11:00 a.m.
Paddle to suitable campsite "below" Cave Springs.
That would put you about 13 to 14 miles downstream on your first day. It you average 2.5 miles per hour(you don't have to kill yourself to do that); you should be able to do that in about 5 hours paddling. Plenty of time to set up camp with at least an hour or so of light left.
Day two: Try not to waste too much of the morning sitting on your butt, admiring the view from your campsite. If you can get on the river by 10:30 a.m., you'll have 6 hours of paddling time to make more miles than on day one. You should be able to make 17 mles in a little over 6 hours, or less. That would put you below Round Springs by about 2 miles, and you'd still have some daylight to make camp.
Day three: If you did as suggested on day one & two; you only have about 14 miles to your takeout.
Sleep in, have breakfast, and an extra cup of coffee, break camp & hit the river. You only have about 14 miles to get to the takeout. If you're on the river by 10:30, there is no reason you shouldn't be at Two Rivers before dark.