Since a large portion of your daily expenses can potentially go to food, be careful of a lot of restaurant eating. Instead, visit a grocery store and grab fruit, peanut butter and crackers for breakfast, tuna snacks and cheese strings and olives for lunch. If you want to treat yourself, have one meal out a day and make it a buffet or wood oven pizza; something economical but in a nice setting like a patio or waterside.
Also, a lot of money can be saved on booking hotels if you call the hotel directly (rather than going through an 800 number or general travel website) and ask for any promotions they have going on. You will ALWAYS be quoted a lower rate than “rack” rate, the rate given to people who just ask to reserve without asking if there are any specials going on.
And if you can find a place to dine where the locals go, ask someone in the area about tour operators for attractions. They always know the best deals! Good luck!

I’m also having a hard time saving my money when holiday. I can’t resist to buy things when holiday season.

Make lunch the big meal it’s cheaper in most restaurants

There is a great holiday site which showcases the very bets holidays from several companies with a bargin page where you can find the latest special offers.

They have Uk breaks, europeans breaks, worldwide breaks, activity holiday, caravan & camping, cruises, hotels, flights and bargin deals.