Having traveled extensively across the globe both for leisure and work, I though it would be helpful to share the list of resources which I use, and would also recommend for getting the best deals and a hassle free travel experience.
Hotels, Resorts, Homes, Inns, Apartments and other unique places to stay: Booking.com
Tours, Experiences, Activities, Tickets & Attractions: Viator.com and Getyourguide.com
Destinationsredefined.com 