Sonoma is more laid back than Napa, but I’m not sure a “reasonable” tasting room exists nowadays, unfortunately. That said, Bedrock and Auteur are good tasting rooms in town and it looks like they are still $45 a person. Hanzell is a classic with great views just north of town, but probably more expensive.
Girl and the Fig is kind of the nice restaurant in the town square. Personally, Valley Bar and Bottle is one of my favorite restaurants in the Bay Area, but it’s laid back. They have an even more casual seafood shack, Valley Swim, which I also recommend. And right nearby is El Molino, where we go to get something close to Tex-Mex, but probably not what you would care for. It may not be what you are looking for, but Enclos is a restaurant in the square that opened last year and went straight to two Michelin stars. Have not been so can’t vouch.
As for hiking, it’s going to be hot AF so would suggest driving towards to the ocean, but otherwise off the top of my head the Taylor Mountain Preserve near Santa Rosa has good views and hopefully good breezes.