DD1 was exactly three when DD2 was born.
The best tip I got (on here, I think) was to make a "busy box" for her. So she had a special box, near the chair where I would sit to feed DD2. Box contained an assortment of colouring things, magazines, small toys and snacks that she could manage on her own. After she'd gone to bed, I put some new things in, so she could discover them the next day and it didn't get boring.
Her strongest abiding memory of DD2's first few weeks is "I had a special box with cartons of juice in, which I was allowed to drink all by myself"!
And will she listen to music/story CDs? I never mastered feeding and reading at the same time, but DD1 loved listening to something on the CD player.
Beyond that, nice, slow walks to the park, where baby will hopefully have a nice long snooze. Personally I wouldn't book for summer holiday courses etc, because if she doesn't settle you'll have more stress, not less, and you don't need to be getting anywhere for a certain time. But you may be more organised than me!