I agree with you, that in life we should try almost everything. But it is very important to know where to stop. I'm not sure that you will satisfied from swimming in the ocean once. It is better to prevent problems before it can ruin your life! Ocean is not the safest place for entertainment. Moreover, as you know our World is not staying in one place, it always keeps moving. Special Water Parks are exist where you can also have fun and entertainment. The topic of our discussion is not to restrict swimming in a pool or in an ocean, but to define which of this places are better for swimming. So, i believe. that swimming in a pool is better in terms of security, sanitary. And in terms of entertainment, swimming in a pool is not worse than swimming in the ocean, becuse of the novations of the 21st century.