Santos is plenty fun, but I needed a change of venue, to switch things up for my long ride. Even the green trails at Santos are fairly twisty, which is more fun in general, but makes it harder to do sustained endurance riding, when you are accelerating out of turn after turn. Most riders are not concerned with this. But if you are and would rather not get your long ride on the road, Paisley Woods certainly fits the bill. The main loop is about 19 miles with a half a mile feeder. There is a cut off to make a half loop. I was running about hour and a half laps, so multiple laps are need to get the higher durations. The Paisley Woods trail has a different feel in each direction, so between that and the half loop you can put most any duration rides together without getting bored. Don't get me wrong this trail is like 90% flowy singletrack.
Wider tires, such as 2.35 or 2.4s work best in the occasional sugar sand. I got to try out a 2.35 Maxxis Ikon up front for the first time. I have had it for a while, but was waiting for a tire to wear out. I switched back to the 2.2 for the half lap at the end to compare. Even at the same 20 psi the 2.35 felt less harsh and I should be able to run even softer.