Hi guys, I'm am going to be generous and give free uses of my XP farm 
all you need to do is warp to dino city! from there exit out the little room and go to where the nether portal is from there you should see a house straight ahead with two item frames with diamonds in them, take a left into the forest and keep running toward the forest until you see a desert biome with two big houses, you should see a big cobblestone home go behind it and you should see four torches from there you should see some signs ENJOY!
Photos:
http://imgur.com/65hq6hr <---- Entrance Signs
http://imgur.com/oY219aW <------ Outside the entrance with four torches
http://imgur.com/we62St7 <---------- Cobblestone house in desert biome
http://imgur.com/VC5CqGs <-------- House with the two item frames with diamonds
http://imgur.com/N84669o <---------- Spawner
It is a Cave Spider Spawner so bring good armor and weapons
all you need to do is warp to dino city! from there exit out the little room and go to where the nether portal is from there you should see a house straight ahead with two item frames with diamonds in them, take a left into the forest and keep running toward the forest until you see a desert biome with two big houses, you should see a big cobblestone home go behind it and you should see four torches from there you should see some signs ENJOY! Photos:
http://imgur.com/65hq6hr <---- Entrance Signs
http://imgur.com/oY219aW <------ Outside the entrance with four torches
http://imgur.com/we62St7 <---------- Cobblestone house in desert biome
http://imgur.com/VC5CqGs <-------- House with the two item frames with diamonds
http://imgur.com/N84669o <---------- Spawner
It is a Cave Spider Spawner so bring good armor and weapons