There is a saying that the best camera is the one you have with you.
If you have no ideas about cameras, then a DSLR is worse than your iPhone. You will be fiddling rather than shooting.
I have a Nikon D5000 and 3 lenses. I rarely use it. I use my iPhone every day and get great shots.
If you are only going to post to a website, then resolution (megapixels) is irrelevant because you won't be uploading anything bigger than 400k for website viewing.
For typical tourist/travel website shots I'd suggest investing in an iPhone 6 Plus or even a 5S or an HTC One and buying
the little add-on telephoto and wide angle lenses. This set up will give you what you need for this application, and will always be ready at hand to take the shot.