Better to start in the morning, with no hurry. In Lokev you can have a breakfast and start the route to Sezana, nice and smooth. After the border turn right so you can ride through many nice villages where there's always some "osmica" opened, private farms that open just a couple of days a year and sells their own wines and foods.
From Kriz / Santa Croce, turn left after the descend starts and enjoy the panorama from Pucino way that takes its name from the ancient roman wine that grew on this fields
In Grignano the best place to take a bath is nearby the Miramare sea park reserve (just at the end of the marina). From the stones you can take nice dives. If you like there's a private bath too on the other side.
Riding from Grignano to Barcola the seafront way takes you till the "pineta", a small pine wood. In the meadle of it there's a fountain and near a nice jamaican style bar. If you don't overdo, you could be able to take the rise on the other side of the road, and cycle back and, after such a nice day, have a dinner in Lokev' must old restaurant "Muha"