4th birthday coming up ?

It's Charlotte's 4th Birthday on the 24th April and we was going to have a party for her but as I'm due just over a week before her birthday we thought we would take her out for the day (baby being born permitting!)
We've thought about taking her to chessington as its only a hosrt drive away and it means we can take our time and bubs can come too - df can take lottie on the rides. We took her for her birthday last yr and she loved it!
I was thinking more because of having the baby who will only be around 1-2wks old at the time. That way we're a short drive from home if we need to get back and dd can enjoy her day properly!
Has anyone else had to do a birtday for thier child soon after having a baby? Just wondered what other ideas there were?