Play dough, painting, big boxes to turn into boats/cars/fairy houses, cinema afternnon(DVD and popcorn), baking, den making under dining table, story time, dols tea party, cbeebies website, Lego, scavenger hunt round house (list or picture list of objects to find), marching band, soft play, walk in woods, park, dressing up, snap, etc
Maybe go to pound land and get a few things to dish out when you are deperate, kids playing up but newborn needs attention, or lots of stocking filler your things - rocket balloons, glider planes, bubbles etc
Blow up a load of balloons
Water play in garden - fill up bowls and buckets and let them play with plastic cups etc
With a newborn you aren't going to want to go far, especially of you don't drive so I would mainly think of things to do at home (been there with a newborn, 2.5 yrur old and 4 yr old, not driving) is there any good friends / family who would take them down the park or an afternoon once a week maybe?
Maybe every day get out one toy eg train set/ Lego/ happylI
nd etc do they have something different to p focus on everyday
Give them job to do to help with newborn, mine loved getting nappies, helping to bath, etc
Invite people round to play (with their parents) gives kids company as well as you and extra pair of hands to help out with kids or baby
Plan lots of things but don't forget to schedule pj days for when weather is rubbish, baby been up all night and you just need to sit on sofa and let kids play on floor!!
Theme days help to keep kids entertained
Eg farm day - print off farm pictures to colour, read any farm stories you have, play with any farm toys you have. Make farm animals from play dough, maybe theme lunch too so lots of fruit and veg from the farm.
Other themes - space, rainbow, beach, castles, bugs etc