1

Hi Llaci;
I haven't gone there, but it looks good - http://www.surfeldorado.com/ the link is in french but they have a google translate button on their site , si vous ne parlez pas le francais.
I lived in ElSalvador until I was nine - and have gone for a few times.
Beaches are nice, but it depends where you go.
H.

2

Dark sand, some areas are rocky/stoney and others are not as rocky. Some trash here and there but nothing all that different from most populated beach areas throughout CA.

3

There are about 300 kms of beaches, so there are different kinds (like #2 said). Usually black sand and strong waves (surfers destinations). Costa del Sol is somewhat whiter sand, and is an endless beach, and Los Cobanos is also whiter, from the conchs and things living on the reef.

El Salvador is the 1 day country. In one day you can be up a mountain, or on a volcano, and then another day at the beach, another visiting an archeological site, another small coffee growing towns - because there is good infrastructure and the country is small.

It is the least touristy (in visits) of all the Central American countries, so if you go out of the tourist hot spots (like El Tunco Beach) you might not see any tourists, so you can have a more authentic experience of the kind people living there.

Here is someone who was going only to pass by between countries through El Salvador, and stayed for 4 months, and later on came to live here:
http://www.wtf-elsalvador.com/

4

Come! We have some great beaches. If you are surfers some great waves both on the west(la Libertad, Tunco, Sunzal, Zonte) and east coast(Flores-Cuco). If you not surfers Playa San Diego, Playa El Espino(remote but 11 kms of Black san beach). ES also offers some pretty cool litle towns, Ataco and Juayua on the flower route, Suchitoto(where I live) in the central part of the country, Alegria, Perquin, La Palma all nice places to spend a night. One of the best things about Es is its size, it is very easy to get around on the chicken buses or if you budget permits private driver to get from place to place.
If you decide to come feel free to contact me here or send a PM.
Enjoy your trip whatever yopu decide