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Tourist season.
Summer
off season is the best.
NO
I have no idea where "Belarus" is but I'm assuming you take an airplane. Sorry if this sounds like sarcasm. :)
Summer (December to March).
Yes a visa is required.
Belarus
Gymnastics
The best season for travel all depends on where you are traveling to. If going to Europe, tickets tend to be cheaper in the winter but it is cold. If going to, say the Carribean winter time is great. Summer is easier for travel because children don't have school.
I would think that travel over seas wold be the best in the winter because the weather would be better and the costs would be less. I would be wary of travling during hurricane season.
Yes of course it is possible to do so.