There are many like :-
1- Keeps the near by area coooool, just like me.
2- Good for tourists. U know, many people get attracted from beaches and all.
3- Awesome for Trade, like India can trade with many eastern and western countries like Japan (east) and Europe (west) .
4- increases economic value of the country.
5- Helps on tidal electricity generation as it is only possible where tides are available.
6- We can get many minerals with the help of the sea.