To eat the oysters
Oysters have a different flavor from every region they grow. I personally recommend to eat the first oyster naked, without any topping, to experience the pure flavor. For the next oysters it can be nice to add some lemon, lime, tabasco or an other topping. The traditional way to eat an oyster is to slurp it straight from the shell, with the water as well. I always make sure to cut the oyster loose, so it will slide down easily from the shell.
It is old tradition that oysters could only be eaten when the 'r' is in the month. This comes from transportation issues, because in the old days oysters would be on the road for several hours to even days, without any cooling. Usually when the 'r' is in the month, it is quite warm and the further one is from the coast, the longer it would take for the oysters to arrive, so in the past they would often be spoiled before arriving. Nowadays with refrigerated transport and trucks this is no longer an issue and oyster can be eaten throughout the entire year. Oysters reproduce in the summer and are normally a bit creamier and fatter, but they can still be eaten and it does not bring any risk along.