Tipps for living in Paris?

[Mia333]

Hi guys,
my name is Mia and I'm from Germany but right now I'm living in Paris for 3 months to do an internship. Well of course I'm also here to see new things and to make memorable experiences. Maybe some of you could help me while giving me tips what I shouldn't miss because I'm here for the first time? I'm a student so I can't spend a lot of money and that's why I would prefer some cheap insider tips =)
On the internet I've found a website named smart save france offering 20 % discount on several attractions. That's a really good advantage to me because some sights can be expensive.
So I would be glad about getting some answers from you!