If you can fit it in the car/on the train - take it! We went to Wales when DS was 1, and he spent a lot of time in his carrier, but pushchair was great for naps/feeding him when there was no highchair available (eg picnics).
Have you got a lightweight pushchair? We have just bought one for our holiday as DS is 11 months. We have got a sling but I thought sleeping would be better in a pushchair! You can usually get secondhand lightweight buggies (chicco etc) really cheaply if you don't have one already. Look on ebay for closest auctions to you.
Shoshe - cool, I probably do...not sure DH will agree as we've only just bought the backpack!
Bertie, we don't have a lightweight pushchair at the moment but I think we might need to get one to keep in the back of the car.
DS doesn't really sleep in the pushchair and we'll probably only stop for lunch where there's a highchair or have a picnic on the beach...still not feeling to comfortable about not having the pushchair.
Perhaps I need to let DH decide (and carry everything as suggested)...and then blame him when it is a complete nightmare
We're going by car and a bit limited on space as we need to take travel cot, bedding, DH's shoe collection etc. My Mum is joining us halfway through so I guess I could ask her to bring a cheap one with her if we found ourselves in pushchair crisis!