Istria's heart-shaped peninsula carries Pula's Roman amphitheatre, Rovinj's Venetian-era harbour stacked with painted houses, the hilltop towns of Motovun and Grožnjan, and the white-truffle country of Buzet inland.
Rovinj packed with Italian and German tourists, Pula Film Festival in mid-July uses the Roman amphitheatre, and the coast at peak with Adriatic warming.
White truffle season in the Buzet hills opening September, Istria wine harvest, and Motovun Film Festival in late July aside, the truffle hunts are autumn.
Adriatic warming, Rovinj's Old Town walking pleasant before summer crowds, and Motovun and Grožnjan accessible without summer parking pressure.
Mild Istrian winter, white truffle season continuing into December, and Pula's Roman amphitheatre accessible without summer crowds.