I am travelling with a bunch of friends but will find myself in San Juan for one night by myself. I arrive around 3pm and will be taking off the next day around 2pm. I am a 28 year old female who has travelled a fair bit so not too worried about exploring on my own. Can anyone suggest somewhere good and relatively cheap to stay, ideally i would like to stay at a hostel, and also be close to some good nightlife. I'm not into clubs but would like to check out some cool bars.