Hi! I found this explanation on the
Disneyland site:
Alfresco Tasting Terrace - Enjoy your favorite wines along with small Italian-inspired appetizers on the second-floor terrace overlooking Cars Land's Ornament Valley.
Mendocino Terrace – Wine sampling that’s overseen by a wine expert. You can buy wine by the glass or bottle, and enjoy your selection at the counter or under the shady trees of the plaza. The experts are there to answer your questions about the products offered.
Sonoma Terrrace - Sample of diverse selection of craft beer, plus enjoy gourmet meat and cheese plates.
I love the Alfresco Terrace. It's small and has a nice view out over Radiator Springs etc. They have a limited menu of appetizers but it's one of our favorite spots to hang out. As I recall, it isn't open in winter.