I’d be happy to help plan a 10-day trip to Koh Samui, Thailand on a budget! Here’s a sample itinerary:

Day 1: Arrive in Koh Samui, check into budget accommodation (cost: around $10-15 per night)
- Travel method: Fly into Koh Samui International Airport, then take a shared minivan or Songthaew to your hotel (cost: around $5-10 per person)
Day 2: Explore Chaweng beach and surrounding areas (cost: free)
- Travel method: Walk or rent a bike to get around (cost: around $3-5 per day for bike rental)
Day 3: Take a day trip to the Ang Thong National Marine Park (cost: around $40-50 per person for a speedboat tour)
- Travel method: Take a speedboat tour from Chaweng
Day 4: Visit the Fisherman’s Village and the Bophut Beach (cost: free)
- Travel method: Rent a bike or take a local bus to Fisherman’s Village (cost: around $0.5 per trip), then walk or take a tuk-tuk to the Bophut Beach (cost: around $2-3 per trip)
Day 5: Take a day trip to the Koh Tan and Koh Mudsum (cost: around $25-30 per person for a long-tail boat tour)
- Travel method: Take a long-tail boat tour from Chaweng
Day 6: Visit the Wat Plai Laem temple and the Secret Buddha Garden (cost: around $5-10 per person)
- Travel method: Rent a bike or take a local bus to Wat Plai Laem (cost: around $1-2 per trip), then take a taxi or local bus to the Secret Buddha Garden (cost: around $2-3 per trip)
Day 7: Take a day trip to the Koh Phangan (cost: around $20-25 per person for a ferry)
- Travel method: Take a ferry from Koh Samui to Koh Phangan
Day 8: Visit the Na Muang waterfall (cost: around $5-10 per person)
- Travel method: Rent a bike or take a local bus to the Na Muang waterfall (cost: around $1-2 per trip)
Day 9: Take a day trip to the Koh Nang Yuan (cost: around $20-25 per person for a long-tail boat tour)
- Travel method: Take a long-tail boat tour from Chaweng
Day 10: Relax on the beach and enjoy your last night in Koh Samui (cost: free)
- Travel method: Walk or rent a bike to get around (cost: around $3-5 per day for bike rental)
Note: This is a sample itinerary and can be adjusted to your preferences. Prices and activities may vary depending on the season, please check the current situation before planning your trip. Also, please note that the cost of accommodation, food, and other personal expenses are not included in this budget. Some additional activities you could consider are visiting the Big Buddha statue, taking a Thai massage class, or visiting the Hin Lad waterfall. For transportation within the island, you can also rent a scooter which cost around $10-15 per day. To get around the island, it’s also possible to take local public transportation, such as songthaew or the local bus which is relatively inexpensive.