YOU SAID:

if you don't go to the beach, you won't go to the beach

INTO JAPANESE

ビーチに行かないと、ビーチに行かない

BACK INTO ENGLISH

I don't go to the beach unless I go to the beach

INTO JAPANESE

私はビーチに行かない限り、ビーチに行かない

BACK INTO ENGLISH

I will not go to the beach unless I go to the beach

INTO JAPANESE

私はビーチに行かない限り、ビーチに行かない

BACK INTO ENGLISH

I will not go to the beach unless I go to the beach