The World of Spa malarky is lovely but take a magazine or book and flip flops in with you so you can lounge around in one of the cozy seating areas between steam room visits.
There's a really lovely Booths supermarket a couple of miles away from CP in Penrith just off the motorway which although not the cheapest is full of the most luscious food and we like it as a eating out/bringing own food compromise! We stock up on the way.
CP's own delivery service for takeway is good too though. It's one central kitchen that has Indian, Chinese, Pizza and some Thai dishes which you can order any combo of plus the banquet meals are staggeringly huge and good value.
Take the basics....tea, coffee, salt, pepper, washing up liquid and tablets and spare toilet roll as the paltry offering they leave for you doesn't last a day. The Parc Market sell good disposable bbqs so we always plan to have at least one as there is a bbq area outside every lodge. Even at Easter the weather should be fine enough as the areas are quite sheltered.
We also like to take a new DVD for one evening although not all types of lodge have a player so check first.
Family quiz in the Lakeside Inn is good fun and free.
As for activities it depends on your children but DD always like the family horse riding trek. Adults aren't obliged to go it just means all ages!
DH took DD on the new caving experience which was expensive but both declared it was the best thing they had ever, ever done!! Never seen either of them so excited. It is tough though!! A real challenge and outrageously realistic. Would recommend that!! It lasts an hour and they spend the next hour recovering!
Anyway, boring myself now so will leave it at that 