I don't know about the drops coming from the crankcase tube, but the oil coming from the exhaust is very simple: The oil in the gas mix is not getting burned.
Now, the reason the oil isn't getting burned is a bit more complex.
The cooling system in a dirt bike lacks a thermostat, which I never really understood. The result is that if you are not riding them hard they tend to run cold. Like MXSparx said, if you are only riding 10 minutes at a time you may never be getting the bike up to a temperature where the oil will burn instead of coming out the exhaust in liquid form.
There is a very good chance that the carburetor is jetted too rich. My experience has been that the bikes are jetted too rich from the factory so if no one has gone through the jetting process it could be too rich. If the bike was jetted for a lower elevation it could be too rich. It's winter now, it may need to be leaned out a bit to compensate for temperature.
There is a very slight possibility that you are running too much oil or the oil is of a poor quality.
You may also have an unrealistic expectation. Two strokes will always have some amount of oil residue in the exhaust.
My recommendation is to start with a jetting exercise. Do a search on this forum and you will find a lot of information as to how to go about jetting your bike properly. This may not only reduce the oil mess but it may make the bike run much better in general.
Rod