From this point forward, things get alot more casual and in general, cash only.
After landing in Ranong, there will be mini buses, taxis and songthaews (basically a ute with chairs and a roof) waiting for one of the two flights a day to take travelers to Ranong pier. While a mini bus can be booked in advance, you should be fine to just show up. At worst, you may have to ask airport staff to help you call a taxi.
Once you arrive at Ranong Pier, you have two options to get to Koh Phayam. Speed boat or the slow boat (ferry).
Speed boat:
The speed boat is not for the frail or faint of heart, personally we love it. If you have any sort of mobility issues, a lot of luggage or infants this may not be the option for you. The speed boat can be extremely bumpy and potentially quite crowded depending on the conditions.
The speed boat will cost you 350 bhat per person (~$17) and will take approximately 40 minutes.
Tickets are purchased in cash near/at the pier and makes the trip to the island roughly every hour from 9am to 4pm.
Ferry/Slow boat:
Although information on the exact times of the ferry are spotty. Some sources say 10AM, some say 3PM, we will attempt to get confirmation. The slow boat is located at a different pier (Tai Kak Pier) than the speed boat, ensure you communicate that you specifically want to take the ferry/slow boat with your transport.