Through my job, I was very fortunate enough to be allowed a brand new lease car every three years. The smell of a new motor when you open its doors for the first time was always a memorable moment for me. Love the smell of petrol, loathe the smell of diesel. Best smell ever for me though, was when we brought our three boys home after my wife had given birth to them and she had bathed them at home for the very first time. Nothing better in my opinion.
The smell once you get out of the airport in a foreign country. Brilliant. Also the smell of the first beer burp on holiday.
Two-stroke. I've followed motorcycles miles out of my way just to keep smelling them. Alcohol on someone's breath. Honeysuckle. Biscuit factories. Someone you love. All of them.