Sounds like fun; I'm going to learn Icelandic first. You see, there are so many things I would like to do but for which have neither the time nor the energy. One such thing is to learn an absolutely useless language, such as Icelandic. I will probably never run into an Icelandic person. There are no scholarly writings in Icelandic (that I know of, who knows?). Oh, but it's such a beautiful language. Just listen to some Sigur Ros and you'll know what I mean.
Next I would probably learn all the languages of Africa. After that, probably all the native American tongues. Then I would move on to the remaining dead languages that NSA couldn't cover.
So there you have it. That's what I would do in my spare time, in those first couple days in heaven.