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: sand, sun cream, water, food, rubbish