This itinerary follows the exact route we took from Bangkok down to Krabi, visiting mostly authentic and hidden gems that took our breath away. The itinerary includes everything I recommend seeing in Bangkok, Ratchaburi, Khao Sam Roi Yot National Park, Koh Phangan (NOT a hidden gem, but my recommendations for the island mostly are) and finally Krabi. I hope you find it useful! It's a more enriching way to make it to the south than the standard sleeper bus from Bangkok to Phuket that misses all the incredible gems on the way!