Furthest latitudes and longitudes you've visited

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64.4 N (a bit north of Reykjavik)
18 S (Northern bank of the Zambezi, a bit downstream from the Victoria Falls)
122.5 W (San Francisco)
121 E (Manila)

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North 60N
South 8N
East 81E
West 124W

approximately

Tricky..
North -possibly Oslo or Helsinki, though I go for St. Petersburg.
South - I go for the southern tip of the Indian peninsula, that you most likely have visited (see eastern longitude). Ethiopia (a bit south from Addis), Venezuela, Colombia and Panama are other possibilities.
East - Somewhere in India (Lucknow?)
West - Somewhere on the Pacific coast north of SF. I go for Victoria island.

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Ooh, someone try me. All of these values are fairly rough.

N: 51°N
S: 1°N
E: 114°E
W: 124°W

N - depends how rough your figures are. London is at 51.5, so it is theoretically possible, especially if you are referring to a LHR layover. Otherwise, I also go for Calgary.
S- Considering how far East you have travelled, this is most likely Singapore.
E- Hong Kong
W- Victoria Island

[Franknburger]

someone can try mine:

North    60N
South    13N
West  122W
East     43E

2 of these are somewhat easy, 2 are difficult so here's a hint: 4 different locations, but 2 in the same country.

With the hints, it is not that difficult anymore:
112 W is San Francisco
13 N can't be in Asia. Sahel is unlikely (you would have travelled there from a more southern spot such as Addis, Lagos or Abijan). That leaves slight chances for Banjul or Tegucigalpa, but the most likely location is Barbados (to get more specific -the Gap or Oistin Bay).

So N and E must be in the same country, which can only be the Russian Federation:
60 N is St. Petersburg
43 E? - Well, I would go for Nizhny Novgorod, if that wasn't already on 44 E. The only larger Russian towns on 43 E are Pyatigorsk and Mineralny Vody.

Unfortunately, I have already given the names of my locations. To allow you some guessing as well:
The furthest north aside from Iceland was 58N
The furthest west outside the USA I have come is 79W.
The furthest south outside Africa I have come is 9S.
The next furthest east after Manila was 119.5 E.