Edgeville & The Grand Exchange are great places if you have loads of any skilling to do, as there is always people to talk to and usually funny shit happens randomly, and also sometimes there are events like drop parties & such to keep you entertained.
If you are looking for a bit more peace & quiet, SW chest is pretty good on the non-SW worlds, or the banker at Daemonheim is pretty relaxing aswell.
Another good spot is either the Duel Arena or Castle Wars, as you can alch and watch the fights going on at the same time, which can be pretty entertaining sometimes.