October 18 day trip itinerary

Hey fellow travelers! Planning an 18-day solo trip to Thailand in late October and looking for some itinerary suggestions. I’ll be visiting Bangkok, Chiang Mai, Pai, Krabi, and Koh Phangan (for the full moon party on October 30th). I’m interested in hikes, waterfalls, nightlife, and just wandering around to explore the local culture. Any recommendations on must-visit spots, hidden gems, or activities in these areas? Would love to hear about your experiences and any tips you might have. Would love if someone had any advice on which route to take. Thanks!

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