Solo travel [31F] doing SEA for 54 days (Jan-Feb 2027). Feedback on itinerary?

Hi! I'm planning my first big SEA trip following a bit of the Banana Pancake Trail. I’m from South America and this will be my first time in Asia. I love adventure (surfing classes, scuba, any activities involving heights), enjoy nightlife with a mix of relaxation.

This is the itinerary that I have in mind:

- Bangkok, Thailand - 6 nights (Jan 7-13)
- Chiang Mai, Thailand - 7 nights (Jan 13-20)
- Luang Prabang, Laos - 5 nights (Jan 20-25)
- Vang Vieng, Laos - 3 nights (Jan 25-28)
- Hanoi + Ha Giang Loop 3D/2N, Vietnam- 6 nights (Jan 28 - Feb 3)
- Hoi An, Vietnam- 5 nights (Feb 3-8)
- Saigon, Vietnam- 4 nights (Feb 8-12, during Tết)
- Siem Reap, Cambodia- 5 nights (Feb 12-17)
- Koh Lanta, Thailand - 5 nights (Feb 17-22)
- Singapore - 5 nights (Feb 22-27)

Main activities planned: Elephant Nature Park, hot air balloon + paragliding in Vang Vieng, Ha Giang Loop (easy rider), Hanoi Train Street, Vespa night food tour, Angkor Wat sunrise, surf lesson in An Bang, Discover Scuba in Koh Lanta, Maya Bay day trip, biking East Coast Park Singapore.

Things I sort of ruled out: Bali/Philippines (rainy season).

What do you guys think of my itinerary? Anything obvious I’m missing that I’d regret skipping? Any hostels recommendations? I plan on doing a mix of dorms and private rooms.

My budget is about 10k with flights. But would love to spend less than that.

Thanks a lot!