I've travelled a lot, though haven't been to tunisia. I've been to all but a few countries in Europe, to India, and to America (New York city, and a short visit to Bufalo), and I've lived in Canada for a year as an exchange student (Kinston, Ontario) as well as visited Toronto several times during that year, and once before.
As for travel recommendations, in Europe, I recommend Krakow, in Poland - it's got a very nice old town, with great atmosphere, and a good many cellar bars, good beer and great vodka.
It's also very close to Zakopane in the south, which in the winter is a great location for downhill skiing, and in the summer has some great hiking routes in stunning mountain territories. I've both skied there, and hiked there, and have some great memories. It's much cheaper than the alps, and you'll have a great experience. I also like the Slavic food.
Another great place to visit is Edinborough in Scotland - I'm a real fan of single malt Scotch, and the whiskey shops there.... wow. And the architecture, and scale! There's a huge castle on top of of high hill, and the old architecture includes everything starting from Roman style architecture. (At it's largest, the Roman empire extended into Scotland. )
Prague, which is often called the jewel of Europe, has a gorgeous old town, more impressive than elsewhere in Europe (though Edinborough comes close) - however, the negative is the prevalence of highly skilled pick pockets in this very tourist-attracting location. Be sure to have little money in your wallet, and most of what you carry under your shirt, inside a thin waist-pouch that you can't spot from the outside, and can't access easily, if you go there. It IS worth a visit though.
India is great for a longer, back-packing journey - I'd recommend reserving at least three weeks, preferably more for a trip there. Partly because most westeners that go there, end up having some sort of a stomach bug that may take some days to recouperate from, but mostly because there just is SO much to see and experience.
Go there with a relaxed attitude, knowing that if you have a task to achieve for the day, such as reserving train tickets, expect it to take the whole day. Get the lonely planet guide to India, and read it's tips for travellers.
I backpacked there for a month, arriving in New Delhi in a group of (I think it was) 28 students, and we broke up into smaller groups to go backpacking, planning to converge in Goa towards the end of our trip. Out of those 28, I was one of the two lucky ones that didn't get sick during the whole trip. And funny enough, I approached the whole thing with the most careless attitude - I ate everthing that looked good, thinking that if I'll get sick, I'll worry about it then, not before! Apparently, I've got a pretty good immune system!
In India, if you are planning to go to Agra, to see the Taj Mahal, know that it's a tourist hell - you won't be able to walk two meters without someone, or more likely several someones trying to sell you something, though the immediate area around Taj Mahal is peaceful, being off-limits for vendors of any type. Agra is still worth a visit though - not NECESSARILY for Taj Mahal, as impressive as it is, but for a small restaurant called Zorba the Buddha. It's a vegetarian restaurant, which shouldn't put off any meat eaters - in India, vegetarian food is, I think, more varied and delicious than meat foods.
Our group went to Agra, and after seeing Taj Mahal, we were determined to move on the next day - however, after eating at this restaurant in the evening, we decided to stay for two more days, suffering the tourist hell just to be able to eat there two more times. It was THAT good. We had one travel guide book that had reviews on many restaurants across India - the entry on this particular restaurant was short, and to the point: "The best restaurant in India." I don't think the book was exaggerating.
If you plan a shorter trip to India, then I'd recommend Goa - it's got beautiful beaches with fresh sea-food, and short trips to inland towns. It's kinda India-lite. Less intensive, more reminiscient of Portugal, which was it's collonnial master for some time.
I've got too many travel memories to relate in one post - I love travelling and experiencing different cultures and the variety of foods and drinks the world has to offer. Unfortunately, I'm pretty broke at the moment, and can't afford to travel.