Don’t bother in all honesty. Ultra short diets have a poor benefit to risk ( of feeling unwell etc) ratio. Not ideal before a holiday, especially an activity holiday.
Best way to lose would be (as said above) a modified fast (ie low cal) but with a relatively high protein diet. You would lose water in the first few days (which will be replaced again on coming out the fasted state) which will make it look like you are losing weight (just water, so you are not), and only then will you start to fat burn. But unless you get it just right you will also muscle burn to some extent and may well feel unwell (tired hungry bowel disturbance). Fine tuning will avoid these but that can take time.
The overall fat burn in 2 weeks will be pretty minimal.
Interval training may help, but equally to get it right takes practice and you put yourself at risk of injury/strain before your holiday.
Medium to long term weight loss would definitely work though.