From the parking lot you take the signposted "Lindkogel" course, which takes you up to the top of the Lindkogel mountain (about 600 meters altitude difference). I suggest to have a break in the lodge up there to enjoy an Apfelstrudel. From the lodge it you follow again the "Lindkogel" course, going down a fantastic and exciting single trail. At some point the "Lindkogel" course joins the "Harzberg" course and you follow both signs until the "Harzberg" course turns to the right. From there one you follow the "Harzberg" course, which is a gain a mix of challenging downhill trails and forrest road climbs. Once you complete the "Harzberg" course you'll be back on the shared trail and can complete the "Lindkogel" course to get back to the starting point.
All in all you'll cover about 1.500 meters in altitude difference and some of the most exciting trails in the proximity of Vienna.