Tripcaster: 

Planning a month-long trip this summer, thinking South East Asia, but very open to suggestions & recommendations on where to go in the region.

Where should we go?

I work for Ethereum at the Ethereum Foundation.

Vietnam and Thailand. I would've said Golden Triangle a decade ago, not anymore

If going a bit more west: Northern Pakistan, Southern India

Where specifically would you recommend in Vietnam and Thailand?

Thailand Island Recs:

Thailand
1. Ko Phi Phi - beautiful island, home of the famous Monkey Beach. Fun nightlife if you're into that!
2. Ko Tao - a diving island, more developed than Ko Phi Phi. Lots of great scuba diving there or free diving if you're into that. 
3. Ko Samui - a more developed and larger island.

Vietnam
1. Ha Long Bay - worth visiting, not worth staying in the town nearby.
2. Hoi An - great town with excellent food. Also has very cool tailors if you want clothes fitted
3. Hai Van Pass - would definitely recommend renting a moped for this 21km route!
4. Ho Chi Minh City & Hanoi - both worth a stop