We usual buy an umbrella in one of the shops, and use our beach towels, but if youre not taking your own towels,you can buy cheap ones there,
last year the beach umbrella cost us 12 euros,and we used it for the whole 2 weeks, and then left it in the hotel for other people to use,we definately had our moneys worth from it
so if you go for 7 days, and buy 2 beach towels and a beach umbrella, it wouldnt cost more than 30 euros,,which is cheaper than 2 days hire of sun beds and parasol, and you could either take them home again ,or leave them for other guests,