Future-Drama! Bart and Lisa see a peek into their senior year.

I'll always like the future in Lisa's wedding more
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Right about now, you're probably saying, "Troy, basically every post starts with 'Guess the Episode', is that all this community is?"
To which I say you've got some attitude, mister.
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Future-Drama! Bart and Lisa see a peek into their senior year.

I'll always like the future in Lisa's wedding more
I never understood why he did it... till now.

Correct!
Also I agree Lisa's Wedding is the best.
I think it's the one future episode with Lisa as the POTUS, 'the president wore pearls'.
The joke was Maggie writing a card from Antarctica,, which now is a beach paradise due to global warming. If memory seerves right, there are even some penguins sonewhere in there.
Very close, it's the future, but not that far into the future. Maggie is also stateside, but you have the right idea.
Probably Alaska then, but I have no clue which episode. These types of episodes are all jumbled together in my mind.