I like the site a lot. Good content, well laid out, clean, user friendly. Only thing that I'm not really too keen of is the animation at the top right. Other than that, I think you have a great site.
It would be better if you add a absolute link (back) to the english mainpage. After I tried the translation, i could not find a link to the original englisg page. (of course, i can use back button from the brows)
Great site if you can make it work. However, it took some work to book, so see if you can limit the amount of clicks to book a vacation. Other then that everything looks great.
Looks okay, but my attention is centered on your header - not content. It's too distracting. You need headings for your content too. People skim, before they decide if it's worth reading
I agree with iskandar regarding the need of headings. I'd also say that there's too much for the user to read -- holiday seekers generally just want straight to the point information, so try to cut down on the content a little. You should also change the font to Tahoma or something else that looks a little more "professional".
Here are my opinions : Better put the special offer as text on the beginning of the content with special text style to make it as a highlight. The coconut tree on the header is like grow from the water, and the beach is look empty.
I suggest changing your header to be about 640px150px. Edit your flash animation to increase your FPS to 30, 60 or 90. Fade between different beach backgrounds....lose the cheesy text. stick with a static graphic text header with a sub title.