noun
1
BAD : Each visitor received a small gift as a memory.
GOOD : Each visitor received a small gift as a souvenir.
BAD : I bought six postcards and a few small memories.
GOOD : I bought six postcards and a few small souvenirs.
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memory = something that you remember and see as a picture in your mind, especially an experience that you had a long time ago: 'The old teddy bear brought back vivid memories of my childhood.'
souvenir = something that you buy or obtain in a particular place (especially while on holiday) and keep to remind you of it: 'The vase is a souvenir of my week in Venice.'
2
BAD : Casanova recorded his adventures in his memories.
GOOD : Casanova recorded his adventures in his memoirs.
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To refer to someone's written account of (a period in) their life, use
memoirs (pronounced /'memwA:z/): 'The former President's long awaited memoirs are to be published next month.'
3
DUBIOUS : You will remain in our memory and we all hope that you'll visit Greece again next summer.
GOOD : We won't forget you and we all hope that you'll visit Greece again next summer.
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You promise that you will not/never forget someone or the time you spent with them: 'I'll never forget the magic week we spent together in Rome.' The phrase remain in one's memory is grammatical but sounds unnatural.
4
BAD : I have many happy memories about my childhood.
GOOD : I have many happy memories of my childhood.
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memory of sth : 'He smiled to himself at the memory of his son's first day at school.' 'The order and discipline of the job brought back memories of his army days.'