I would suggest checking out some library books with fun activities to do with the kids. Different crafts, projects, science experiments etc. There are lots of different ideas. I almost checked out a library book last night about boredom busters. I agree with other posters and I have a mixture of time with them, and time by themselves. I think it is important for them to be able to keep themselves busy...but also to engage in activities together. For DS4 (almost 5) he has a list of about 50 things he can do by himself if he gets bored. If I see him getting antsy I encourage him to check his list. DD22 months does lots by herself too...but more with me in the vicinity at least.
Independent activities (with some supervision as needed): computer games, making up his own games, building contraptions, playing number games, wheel of fortune, play doh, moon sand, drawing or writing, workbooks, playing in the back yard, reading books, playing hide and seek and other games with his sister, playing with lots of different toy things (labrynth, puzzles, Izzi, chocolate fix, peg solitaire games, rubiks things, k'nex). DD does a lot of pretend play by herself. She plays with her ponies, all her stuffed animals. puzzles, She talks to them and feeds them and totes them around. She looks at books a lot, she draws and colors and does play doh and moon sand. She likes to listen to music and dance. She loves running around outside with DS. And of course we have the fall back of a tv show or two. She is really into Hi-Five and peep, and sesame street right now.
Together activities: Lots of board games, treasure hunts (one clue leads to the next), egg hunts, letter hunts (hide letters all around the room) when he was younger he would have to say a word that started with that letter. hitting a balloon up in the air and counting how many times you hit it without falling to the ground, hot and cold, origami, craft projects, science experiments, math games (usually ones he makes up), outdoor games, trips to the park, walks, obstacle courses, planting things together, scavenger hunts outside. I am sure there is more...but that's a start.
