On your final day in Bangkok, take some time to relax and unwind. Start by visiting Lumpini Park, a peaceful oasis in the heart of the city where you can go for a walk, have a picnic, or even rent a boat. After that, head to one of Bangkok's many spas for a traditional Thai massage or other relaxing treatments. Finally, end your day by taking a sunset cruise along the Chao Phraya River, where you can enjoy stunning views of the city skyline while sipping on a cocktail.