Tip 1 Buy a Thai SIM card at the airport, we usually use AIS.
Tip 2 If you are staying on the mainland, rent a car, a convenient way to get around.
Tip 3 Be spontaneous, don’t plan your vacation. On the east coast it may rain while it is a sunny day on the Lower Gulf and South Andaman. Check the weather apps.
Tip 4 Use the app Grab a good way to arrange your taxi!
Note 1 The cleanliness of beaches varies due to weather and seasons. A beach can be super clean on the first day and after windy days there can be rubbish along the shoreline. I’ve been to beaches that were perfectly clean on a first visit, but somewhat polluted on the next visit. Most of our hotels clean their part of the beach.