Assuming your are staying in a s/c house and not a family home? If the former get an inventory of what they have in terms of cookware so you can bring anything else needed. Are the fridges / freezers big enough or are you going to have to go out shopping while there?
I'd make something and freeze in advance for the first night eg curry. Boil in the bag rice for an easy life, popadoms, naan, chutney etc
Can you bring some slow cookers?
Chilli and jacket potatoes or nachos with all the bits, something like a stroganoff / stew, Mexican chicken for fajitas.
fancy hot dogs - bung a load of decent sausages in the oven to bake, baguettes or hot dog rolls, sauces and any other toppings, could serve with wedges
Is there a bbq? Butterfly leg of lamb, Greek style with pitta and salad, or burgers and salads
Go to Waitrose or m and s and get a couple of their entertaining dishes eg lasagne