It's not going to be great. Here is the air quality forecast: https://www.accuweather.com/en/us/napa/94559/air-quality-index/327133
You'll see a daily AQI forecast about 2/3 down the page. The air quality is getting "better", but far from normal and still not healthy to be outside doing anything fun. I'm still not thrilled about having to take my dog for a walk with this air quality.
I think a couple of restaurants had briefly shut their outdoor dining due to air quality; Torc closed patio seating on Friday and was seating indoor only (a point of irony that they had recognized). You would still have plenty of dining options.
At the end of the day, even if the smoke is letting up, you're still coming during a pandemic, and let me tell you: wear a mask if you come. The number of tourists walking the streets with no masks on (until they want to get seated at a restaurant) is unbelievable.
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Is there currently this product offered on Amazon? Would this be it? http://www.amazon.com/DJI-Phantom-Vision-Camera-3-axis/dp/B00LVQFASO/ref=sr_1_3?s=photo&ie=UTF8&qid=1461558104&sr=1-3&keywords=phantom+vision+2+plus