Spend the day at leisure or choose the optional Full Day Khao Yai National Park with lunch. Depart Bangkok in early morning and travel to Khao Yai National Park, a UNESCO World Heritage Site, known for its dense forests, cascading waterfalls, and rich biodiversity. Embark on a hike along the Nong Pak Chee Trail, admiring the local flora and fauna. The observation tower along the trail provides panoramic views of the surrounding forest, making it an excellent spot for birdwatching. After the hike, head to the Baan Ta Chang natural spring, a hidden gem within the park. This is the perfect spot for a refreshing swim in the clear cool waters and the ideal place to unwind. Savor Thai dishes for lunch at a local restaurant before heading back. Arrive in Bangkok late afternoon.