If you want a DSLR & don't want to carry a bunch of lenses, you could get a Canon 18-135 or 18-200mm lens. This is commonly used when traveling to keep the weight down.
Also, maybe consider getting a super-zoom camera like the Nikon P510. It shoots from wide angle to telezoom & has video. It would be light-weight & extremely portable.
Both the Nikon D3000 & the Canon T3 will produce great images but you'll soon find yourself wanting better lenses, flashes etc before long. It happened to me & this could turn into an expensive & addicting hobby.
