You can book all your hotels, resorts and more through Agoda. I did it a couple of times and got some good deals on great accommodations.
Tix.nl is one of the biggest online airline tickets sellers in The Netherlands. With Tix you can search hundreds of airlines for your ideal trip. You can also book your hotel accommodation and a rental car through this site. The website is only in Dutch, but modern web browsers like Chrome can often translate the site quite well.
Good place to find hotels in your holiday destination.