I'm sitting waiting for the 35 Group Pattaya bus at the foot of Kromluang pier in Laem Ngop which takes you to and from Koh Mak. Had a house there for 17 years. But, time to call it a day. I'm 74. The house is 3 storeys. Even renting became a chore. But...
I had some really great times there, and on Koh Chang, and on all the islands that make up the Koh Chang archipelago. There are a lot! Much of it is national park, but also many islands aren't included, so in theory, no landing fee. We used to hire a 30 seat twin engined speed boat for 15k THB and spend the day landing on deserted beaches on uninhabited islands. A fantastic experience! In the days when you could design your own cruise.
And Koh Chang's east coast is really what I love. Very few resorts because very few beaches. It's the leeward side so no surf to make the sand. But follow the wonderful road all the way and you get to salak phet which has surely one of the best seafood restaurants in SE Asia. And climb high up on a scooter, and salak phet bay has to be seen to be believed. Totally gorgeous!