The best way to see the diversity in the USA is to take a cross country road trip. Pack your bags, find your route, and hit the road from coast to coast. Be sure to hit up at least a few national parks on the way!
Sure there are many unknowns when taking on the road in Africa, but that's just part of the adventure! Get yourself a Land Rover, camp under the stars, and experience life the way it should be. Just watch out for the lions.
Natural beauty doesn't get much better than the national parks in Canada. Get yourself a campervan and prepare to be blown away by nature. Just make sure you plan enough time for some outdoor adventures.
Clearly you're adventurous, so why not get a rickshaw and race around India? Don't want to do it as a race? Buy your own rickshaw and spend a few months traveling throughout the country. There's lots to see and plenty of crazy roads to explore on!