To get these places, you can use public transportation like bus. But tbh idk how to get there by bus because I don't have enough time to take risk.
So I used private car with the driver. I booked the car (include gas + entrance ticket + driver) about 4500 bath. but you can give additional tips to the driver if you want.
From Bangkok, its about 3 hours. Fyi, in Khao Yai, there are some cute thematic hotels. For ex Thames Valley Khao Yai.
The weather is quite good but not as hot as Bangkok.
Places I recomend to visit in Khao Yai :
Primo Piazza (France vibes)
Palio (Italy Vibes)
PB Valley Winery (Company tour and wine testing)
Saraburi Sunflower field (good to visit on November - January)
Thames Valley Khao Yai (hotel with English vibes) Super recomend for Afternoon Tea. Literally I'm in love with this hotel.

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