Kazza sorry to hear it is hard. It is very normal so please do not worry.
I have to say my dd, 10 (birth child) is very annoying about a whole host of things and my adopted ds (4) is very annoying about a whole different host of things too.
My best 'advice' (although you did not ask for it) is:
Go easy on them - it is all so new and they are grasping for things that make sense of life, and if that was computer games before it will probably be computer games now (my non-professional opinion).
Go easy on you -find some relaxation be it a coffee and a chat with friends in the evening when kids in bed, special TV show, writing a journal, painting or whatever, find time to relax and recharge and also to have some time with your dh, e.g. a nice dinner at home after kids have eaten and gone to bed
Distraction - try and distract when things are very annoying, as your first port of call, before getting cross or trying to be firm etc etc.
Substitution - if they are playing with a very annoying toy try giving something less annoying and temporarily hiding the annoying item. you ahve to be a bit sneaky to introduce the new item, if you give them the new one straight away they may not want it, so make it look appealing - oh not sure if you will manage this painting set, shall I look at it first with out you... most likely they will run to join in and if they do not you can indeed look at it first and declare, it is just right for you etc etc! We had to hide ds's toy trumpet - WHY did we buy it!!
And my my best bit of advice is to find connection with your kids. Find empathy for what they have been through and find a way to enjoy them. Do things they enjoy and things you enjoy too. Whether t is making an ice cream sundae, gardening, walking a dog, painting etc etc.
This is a good little short movie (few minutes) about the difference between empathy and sympathy...
ConstanceMoan I think you are right that getting out into the countryside could be fun, my kids love wading in wellies in the brook or stream, pretending to fish with nets etc.
However, the children have been there only a short time and to spend night away so soon would be (IMVHO) too soon.
Our son was 3 when he came to us and we did not spend a night away until he had been with us almost 3 months. It was two nights at my sisters house and we made it a little holiday and he was fine, but many people would say that was too soon. We did it because we wanted to see family as it was the anniversary of my father's death and it flt right t see family at that time. Also he had settled in very well and had been away with foster family, who he was very settled with and had met my sister before we went to stay there.
Since then we have been away a lot to a caravan and a hotel. He has a ready bed and sleeping bag we take and his own plates and cups, plus teddies and books/dvds so he feels at home.
Once they are settled a night away can be great but do take it easy, we were ready to come home if we needed too and it can be harder if you ahve booked and paid for a hotel etc. Just my humble opinion.