All I know, is that each time on such holidays, I was losing over 20 pounds.
But I wasn't coming back the previous weight before full year passed, because I didn't have problems with increased hunger and I was very physically active at the time, whole year either I was riding a bike 2-3 hours a day, at fast pace, or swimming for an hour 1-2 times a week or both.
Dieting slows down methabolism it doesn't necessarily help, unless someone generally eats too much and wrong things.
If you diet is otherwise fine, you need physical activity to effectively lose fat.
Not an easy thing. To burn fat from stomach entirely, it took me almost a year of extensive training, and I had already been in good shape and excercising regularly before.
Also mind that training might not necessarily decrease your weight. Muscles are heavier than fat, so if you eat enough proteins and do excercises.
I don't recommend starting off running, walking fast for a longer period of time is better for starters. To me its more fun and easier to motivate to, when I'm going somewhere in the mountains and I'm curious what is after this hill, that hill, that mountain etc.
Running needs slow and gradual preparation and learning to control your pulse. Otherwise you might damage your joints, sometimes permanently, the spine, or heart if your pulse goes too high.