Pier 21 on Terminal 21's top floor has unlimited wifi plus air con heaven. Grab a corner table near the thai dessert stalls for best laptop setup. Dumplings are like 30 thb so buying something small keeps staff happy for hours of work.

If you need actual coworking space, hub co-working on beach road near walking street charges 200 thb/day with printing. Way better than central festival's starbucks where they glare at you after 2 hours.

Pro tip: 7-eleven on second road has surprisingly fast wifi if you buy a 10 thb water and need to send quick emails between hostel wifi crashes.