There's a couple of straight up climbs, one is Lone Wolf, which leads you up to the overlook....the same side of the road as the 'interesting' part of the River Scene trail is. 
The other is on the opposite side of Ries Rd. from the Love trail....the Cardiac. It splits from Justin's at the bottom just off Kiefer Creek Rd. and meets again up at the top. The Cardiac is shorter but most of Justin's is (barring some switchbacks and maybe some of those really loose larger rocky rooty spots) still easier.
Just clarifying since I've heard some people refer to Lone Wolf as the Cardiac, and Cardiac as Anaerobic, which it may be, but isn't.
Sounds like you did Justin's, which is pretty much a section of the Grotpeter, in lieu of Cardiac. Justin's/Grotpeter/Cardiac is a decent comparison to the part of St. Joe I've ridden, in my opinion. Just for a few miles more.
Last edited by singletrackmind; 09-16-2008 at 04:57 AM.
I used to have an open mind but my brains kept falling out.