There are few places you can party but it's just whether people are interested or not, it also depends on who you play with because in a way Guild leves has made players soft. People rather rank up on guildleves then in an actual party. They see the end results in a few minutes rather then hold true skills attained from a monotonous grind. Guild leve mobs are easy and if you fail you can adjust the difficulty, in actual combat outside of guildleves you're not given that option and have to adapt to learn your Class better. There are camps you can grind on but the party people are most familiar with are Raptors at R43-50, you can also do Efts in the 30's gaining about 300-400sp per mob if i remember correctly. R12-18 you can do Cassopeias for 300sp a pop and go from 12-15 in an hour i think. As for 20's im not sure but you can do the tedious Iron Coblyns in Nanawa in the back by bomb quest mobs netting about 20k per hour in a duo-trio party.. When people do the Math they rather get 60k sp in 1 hr rather than 3 hours, but you'll notice the difference between guildleve players and some that still party.