You should check out the Salesforce Tower and the Transitbay. They just opened over the last month or so.
There's not a lot in San Jose tbh. It's urban sprawl of malls, houses and business.
Santana Row is probably the bit to visit if you do go there.
If you want to drive south them Carmel is a decent wee town.
Palo Alto and the Stanford campus are nice.
I don't like wine so I find the Napa / Sonoma vineyards dull tbh.
There are hundreds of vineyards as well so pick wisely. Some of the wine tasting is expensive.
I do like the drive up there though. The scenery is great.
I usually take visitors to V. Sattui and Oxbow public market and we're usually done with it after that.