oh no Lucy please let it not be another blister, poor you and poor DD. enough is enough with all the illness. Must admit, my nails are also in dreadful condition and keep breaking, so wonder if it is an effect from being ill through most of January? Will have to have a 'health kick' when they have gone back to school and plan some really healthy and nutritious meals when I have chance to be left alone long enough to plan something!!!
So far as ideas for activities, hmm, we have had wet weather and dry weather options available for each day. Lego movie was a suprising hit with them - although it wasn't quite as I expected it to be, was wondering if we should have gone to see the other film Sherman and something or other instead. Took them on the 'cheap day' when tickets are reduced.
Baking days always go down well, fairy cakes, scones, biscuits - especially the ones you use boiled sweets in to make a 'stained glass' effect in the middle or shapes made from the cookie cutters and then we use various coloured icings to decorate and sprinkles etc.
If you have any big boxes left from house move or from buying appliances, keep them and they can make and decorate a 'house' from it (just check it first to make sure there are no metal staples sticking out). I also keep some stuff like toilet rolls/kitchen rolls/cardboard packaging so that they can make 'things' to go into house or just do some junk modelling. Den building day also goes down well, have kept some old sheets that they can use, so with cushions and blankets, they can make themselves dens or tunnels and they take their books and toys in there and have a lovely time!! We also make our own playdough and bake it in the oven and then they can paint and decorate that. DVD day - where we watch films and eat sweeties/popcorn and have fizzy drinks usually a winner too.
For nice weather, going to local park with bikes (there are some really good bike rides set up there, so you can just choose a route and follow it). A lot of the bigger museums have special exhibitions for half term and lots of child friendly activities, so it can cost very little to go. The zoo is also a big favourite but is a more expensive day out, same with going to the farm. Seaside also a bit of a tricky one at the moment after all the bad weather... but can be a lovely way of blowing the cobwebs away after being stuck indoors and they like being on the beach and drawing in the sand or building things. A lot of sports centres offer mini courses on a variety of sports stuff, so is often a good way of letting them try something new without a lot of expensive equipment and making a commitment when you don't know if they are going to stick with it. Go on a bus/train ride to somewhere new, take a picnic and explore! A lot of the big shopping centres have activities on too if you go into a town.
We usually have at least one lazy day though as I find they need to recharge their batteries and chill and just do something very low key. Good tempers are then restored!
Good luck!! Sorry for epic post!