Without the electronics available, kids find a whole lot more to enjoy. We always went on nature walks. This also made my then-toddler daughter "very very smart". I did not just read books to her, she participated in the reading. She helped point things out. Ones like "Who Stole The Apples" are rebus-like where little pictures in the text are "read" by the toddler while I read the word parts... like pictures of an apple and a horse replacing those words in the sentence "A (horse) lived in an (apple) orchard." Before I knew it (while still a two-year old) she was reading the words, too!
There are also books WITH electronic (audio) sounds, and when you say a word, they press the correct sound button for it.
During our nature walks we went at her pace and talked about the earth, the leaves, the seeds, the tiny flowers, animals, houses, trees, sunshine, life cycle, photosynthesis, sunshine, clouds, bark, what's under the bark... there is no end to the questions and investigations. She began to become intrigued by nature, medical stuff, the sky, and then flying and astronomy. No wonder she began to love love love science and one of her most favorite "toys" later became a microscope. At 3 she knew the names of the planets, and truly what the solar system is and our galaxy (the Milky Way).
We went to museums. She absolutely loved the aviation museum, and wowed a bunch of female pilots who she wanted to emulate.
And the pretending.... mostly that was with her older sister although her older sister was 8 years older than her. They made tents, cities, cars, sleigh rides, etc out of household stuff and sheets, and umbrellas.
And so many jigsaw puzzles! To keep them fresh and interesting, a group of us mamas rotated our puzzles each week!
And there was her tricycle and later, her father built her a pedal plane that was her "airplane". We tried Fisher Price roller skates which other 2-3 year-olds can do, but she really could not until she was older.
We played board games like "The Squirrel Game".
In the car she always had books and little "activity books" - never electronics.
I loved riding bicycle, so I put a child carrier on my bike and I rode with her while my older daughter rode on her own bike, until the younger could ride on her own.
We'd walk or ride bikes (or trike) to the park where we flew kites, played on the playground, or just walked around.
We went to the local arboretum. We went to the children's science museum. We fed the ducks at various ponds. Everywhere we went could become a "nature walk".
We went sledding, we built snow creatures. We cooked together, We did laundry. While working alongside you, the toddler is learning critical life skills. ALL the children had chores, and yes- even the youngest at 3 had her own chores as well - ones suited to her abilities and level, such as sorting out and putting away the clean spoons (2 sizes), forks (2 sizes) and butter knives.