What should I learn next?

I'm just learning to program for a hobby.
I already have a weak foothold in C++, but I have done things like program Battleship and Yahtzee (with full GUI's) on my TI-83+, completely in BASIC.

What do you guys think I should learn next?
My friends have suggested perl and python.

bah, "features low-level languages can't offer."

in low-level languages you're supposed to MAKE the features you don't have and put them in LIBRARIES.