Granada is well worth a visit. It is a magnificent city and every amenity can be accessed in walking distance. If you don't like walking the local bus service is excellent. If the universities are open enjoy the street cafes. Granada is now to student life what Paris was in the 60s.
If you go to Granada and not visit the Alhambra Palace, you might as well not go at all. You can book online for the Alhambra Palace which saves queing later. Remember one thing, you can visit the Alhambra between 8am and 2.00pm and 2.00pm to 8pm. If you arrive at 1.30pm you will be asked to leave by 2.00pm. It takes several hours to walk the Alhambra so give yourself plenty of time.
Before you go do your homework because Granada has much to offer and you could miss something.
There are several Pay Car Parks in Granada, but you can park free in any of the city centre shopping centres.
Weather in April:- There will be snow on the Sierra Nevada (magnificent backdrop to Granada) but during the day light clothing will suffice.