You may wish to buy a plot of land where you can build your own property on. This is possible, however you would have to purchase the land through a Thai company or lease the land from the freeholder. Samui Exclusive can help you in this buying process.
Land can present a very healthy investment opportunity, however you must ensure that the land can be built on and there are no restrictions on use or structure.
Some land might be agricultural with an ability to convert to residential and may therefore not have mains water and electricity. Ensure the land has been surveyed and you can get access to these utilities.
You should contact your lawyer and get them to advise on what permissions and potential restrictions relate to that land.