This area is like a wedding cake. lake on the bottom, but if you drive there, you will only see the lake. if you drive up and then take smaller roads towards chexbres and vevey, you'll be able to enjoys both the lake and vineyards from a higher elevation. those roads are small and constantly change their names. my best advise is to write down the sequence of villages from west to east, and just follow the signs that will point the way to those villages. Route de la corniche and Bellevue I definitely took, the rest I don't remember.

temperatures will be 57-64, which is nice, but high chances of rain. I was there in September, and I am sure that the lake views are great year round. Not sure if vineyard will be green, need to do some research on that.

You can take the regular CFF train from Lausanne or Vevey to any of the wine villages such as Saint-Saphorin, Epesses, Rivaz, Lutry, Cully, Grandvaux, Chexbres, and walk through the vineyards from one village to another. Ask for a map at your hotel or the tourist office. The Lavaux Express is a small tourist train. The grapes are harvested in September; there's a wine festival in Lutry from 27-29th Sept to mark the end of the harvest.

catch the slow train to Lausanne (S + a number) and get off on the way at any one of the vineyard stops - Rivaz/Saint-Saphorin, Epesses, Cully, Lutry... From these places your walk will be uphill at first. Or get off in Vevey, change to the train that goes up to Chexbres and walk down Or from Lausanne, take the train up to Grandvaux and walk down. You can also hire a bicycle... Ask at the tourist office for a vineyard map. There are also organized vineyard tours that include wine tastings.

There are public footpaths all through the vineyards so you can walk all the way or just parts of it, say from Grandvaux to Lutry, from Grandvaux to Saint-Saphorin, from Chexbres to Riex... or Cully, or a circular tour, and in some of the villages you will find cellars open for tastings - there are also small huts along the way (look for the flags) where you can sample the wine. I often take the train to one of the villages and walk to another one further along the line to come home. There are plenty of mapped walks described on line.

Hello Ben, You can just walk to the vineyards by yourself, there are many routs around. There are many wineries that you can visit and taste wines. So there is not one cellar but many ;)