The answer to if your eardrum
is going to heal on its own depends on the size of the hole any associated infection of the middle ear etc. A very clean, non infected pinhead size holes can heal. A larger hole has to be repaired. This decision can only be taken after an ENT specialist
is able to examine you; which you should do when you get the first chance. My advise to you till then would be not to worry about the water which already went in during the wakeboard event. Avoid any fresh entry of water into the ear. You can wait till you go back to your place and get treated unless you have any fresh symptoms of ear discharge
including pus, pain in the ear etc.