What do you do with your child when the cold weather hits?

Hey everyone, I'm having a hard time with my son, he is 3 years old ( almost 4 will be 4 in january) anyways like any other 3 /4 year old he has boundless energy, he is a happy fun little guy but sometimes his energy drives me insane ( well only these last couple weeks) The cold weather has came and now its to cold to do what we normally do. I'm wondering any ideas of how to help him burn his energy In the house, without driving me insane lol. I don't drive yet ( learning and cant wait) so going any where besides our mall ( anything kid friendly like play places are on the other side of the city) would take 3 hours on a bus and With him and his younger sister ( who is ten months) it becomes very hard! I know he is getting bored ( i mean really he is 3 and just wants to play) so the way we did things before were.

Wake up at around 9 am then we would eat breakfast Play on the living room, then around 10 30- 11 we would go to the park and play until about 12 30-1. come home eat lunch my daughter would have a nap, and he would play quietly in his play room, until about 3 30, we would then go for a walk, to the store or just around the block for an hour or so, come home and do crafts, then he would help me cook dinner, we would eat then play /watch TV then bath and bed...this worked really well of course there was days it was changed like we would go to the zoo, or whatever, But now its to cold and i have to wait until friday to go buy him and his sister better winter stuff. We do crafts, we bake, we cook, we paint , we color I have done everything i can think of but he still has this boundless amount of energy and acts out, his attitude has completely changed and its becoming way to much for me ( I'm also 23 weeks pregnant and sooo tired) I need ideas about what kind of things we can do in the house to burn some energy!