From Velden, the tour leads directly along the Drau cycle path to Villach. In between, you can take a look at the special features of the Drau loop during a short stop and take your first snapshots. Once you arrive in Villach, you can make a detour of just a few meters to the former castle. Through the Drau Valley, the route then heads west with lots of gravel to Molzbichl, where the probably scariest Lost Place of the tour awaits you. If the picks from the early Middle Ages don't scare you too much, there is the possibility to find a treasure guarded by ghosts in Porcia Castle in Spittal. So you should have some storage space left in your framebags ; )
Along the Millstätter See it goes over fine gravel along the south shore to Döbriach. At the Sauzipf area and the old material cable car, your bike can then finally pose in front of some casual motifs. Radenthein is the next stopover. Whether Granatium, finest regional cheese in the Kaslab'n, best Carinthian cuisine at the Metzgerwirt or home brew from Shilling. You have the choice.
If the wind is in your favor, the Gegen valley and Lake Ossiach will be the place to be. If you feel like it, you can still take a climb to the ruins of Landskron Castle or the St. Michael burial mounds. At Gratschach there would also be the possibility to take the way back to the Wörthersee with some crispy altitude meters on gravel over the Ossiacher Tauern. (See for example the Graveltour T1). Once you arrive in Velden, you can reward yourself with a cool down, either in the Teufelsgraben or directly in the Wörthersee.