Where for a family weekend away not too far from London by train?

[IlanaK]

DH can't take any days off so would have to go Friday evening and come back Sunday evening. So short train from London. Not too pricey but maybe a hotel with stuff laid on for the kids (3, 7, 10).

Any ideas?

[grumpypants]

Rochester? Really pretty high street, castle, cathedral and museum, great Italian restaurant, but no kids club type things - you'd have to entertain them yourselves iyswim?

[IlanaK]

Thanks. I was hoping for specific hotel recommendations if possible!