It's doable, two people who used to work for me in a similar field to you became contractors and did a lot of travelling between contracts, albeit I think the market has got more competitive of late.
I think basically contractors tend to fall into two camps, those that do it to maximise income and take relatively few days off, and those who do it for flexibility who tend to float around quite a bit and take advantage of any gaps they have between contracts. When I was a contractor I earned more in 9.5 months than I have in any 12 months of employment.