Advice on safety and hygiene in Alicante

Alicante is a city where you can do wherever you want, you can go to the beach, pubs, sit in a park, etc, but you must take care in what you eat, what you drink or where you go.
Alicante is very famous because of his sun, his rays are very strong so it's advisable to use sunscreen, and wear some hat. Talking about the food, there's a lot places to go, but you must take care with the cheapest places, because the food could be in bad condition. The same happens with the drinks, particularly alcohol drinks, where you go to a cheap bar, the cup may not taste well sometimes.
To finish, let's talk about the places to go to party. There's some streets like in the "Barrio" that is advisable not to go alone, and be always with someone or in group in every small street if it's night.