Everybody always suggests MM. Let me tell you that MM is often overcamped and you will probably spend a lot of time LFG there.
There have been a few suggestions already. Let me add east karana. You can always solo gorge hounds or find some people who are doing craig spiders. LOIO might be another nice zone where some people go without it being overpopulated.
For solo xp you can do the hermit camp in SK. Bring some shurikens to drag him out. Probably best solo xp spot at your level in all of norrath.
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