Hi @Linda1153, we all get those I think. All of yours are easy to accept, to avoid punishment (which will include suspension of you keep declining).
less nights than the minimum: ACCEPT; You are most welcome to come, but only for a longer stay which exceeds the minimum stay. If this doesn't suit you, you have 48 hours to cancel penalty free.
tents on the lawn: ACCEPT: You are most welcome to stay but not with any tents sorry. If this doesn't suit you, you have 48 hours to cancel penalty free.
12 guests instead of 5: ACCEPT: You are most welcome to come, but only five of you. If this doesn't suit you, you have 48 hours to cancel penalty free.