Thailand itinerary advice after research — Phuket vs Krabi vs Koh Yao Noi for beaches & relaxing?

We’ve been researching Thailand for our first trip and after looking through Reddit, YouTube and GetYourGuide, we’re currently thinking about:

- 3 days in Bangkok
- 7 days around Phuket/Krabi islands

The places that caught our attention most are:
- Railay Beach
- Phi Phi Islands
- Koh Yao Noi

We’re a group of friends mainly looking for:
- beautiful beaches
- island hopping
- relaxing
- good food
- nightlife and fun
- some shopping in Bangkok

We want a good balance between relaxing island vibes and places that still feel lively and fun at night.

For people who have already been:
- Which island/base would you personally choose?
- Is Koh Yao Noi worth staying at or better only as a day trip?
- Would you stay in Phuket, Krabi or split both?
- Any places you felt were overrated/touristy?

Would love recommendations from personal experience.