Here is the text with five countable nouns circled and uncountable nouns underlined:

Going to the beach
When you go to the beach you need to take a lot of things with
you. You need a swimsuit for swimming, and a T-shirt to wear for
playing on the beach. You should wear a pair of sandals to walk on
the hot sand. If the sun is strong, it's good idea to rub some __sun cream__ on your skin and to wear a pair of sunglasses to protect
your eyes. Don't forget to take some __water__ to drink and some __food__
to eat. Remember to clear all your __rubbish__ and throw it into the
rubbish bin.

Countable nouns circled: beach, swimsuit, T-shirt, sandals, sunglasses
Uncountable nouns underlined: sun cream, water, food, rubbish