Weekend Rides

Hi Guys heading over (possibly ?) march still not sure dates yet to pick up macan Gts in Stuttgart. 4 adults. I have driven plenty thru Italy and Germany, Austria love the black Forrest, romantic road & done furka/stelvio como to Bodensee many times. On this trip I’m thinking of heading toward the Dalmatian coast. I would love some recommendations and your thoughts/experiences. Weathers a concern for the passes and with 4 adults in car maybe not the best choice this trip. Thanks for any input and advice expertise.