I was very busy - maybe use the present perfect
covered with soft sand- could you rephrase this? It sounds a bit weak to me- most beaches are covered with sand, so you could rephrase it to emphasise the softness
The worst thing is -tense
and nightlife- article missing
It doesn’t really matter- Tense, and how about something like 'However'?
For FCE, this seems fine.
Student or Learner