E50X
The Church doesn't fast during the Octave of Easter, or on any Sunday, out of joy in Jesus' resurrection.
Other than that, though, you're free to continue all the prayers, almsgiving, and good works you adopted for Lent.
See, this is where those who actually fasted during Lent get a little of it back from the pikers who were all, "Oh, I don't think this season is just about giving up, you know. I'm going to be adding to instead." So you're going to stop doing a good thing because...it's Easter?