DB, I'll actually probably park down where you are finishing. what direction are you going, i.e. are you doing Wittenberg to Slide or Slide to Wittenberg and are you doing the loop?
If you're doing the loop, a relaxed pace might be problemsome given that it's about 16-17 miles and I believe there are some tricky spots from the noreaster on Slide that might slow you guys down a little. I will be parking on Slide Mtn Road (aka CR47) to do my trail maintenance, if I am not camping, I can always give you a ride back to Woodland Valley which is where you would start to do Wittenberg at the campground there.... You'll see my blue outback with VFTT sticker on it but if I'm camping, then obviously, I wont be able to.
When you're at the Woodland Valley Campground parking area, you'll walk across the street and into the campground itself and then if you miss a blaze, just realize that you have to cross the stream that is on the far side of the tentsites and there is a bridge over it so if you miss a blaze and it's not too hard to do there, just walk towards the river and generally head back towards phoenicia and you'll see the bridge.
It doesn't get too steep til after you meet up with the trail that goes to the terrace mtn leanto.
You'll love Wittenberg and it looks to be an awesome day for it!
...and if you're doing the loop, try to run into me and I can show you a short cut that most catskill hikers use to decrease the road walk.
If you actually go over to Slide summit and then back to Woodland Valley, its much shorter than the loop with less elevation to do but then of course, you aren't doing a loop
Jay