Talking about the budget, I think it depends. I have mentioned food costs, transportation costs and accommodation costs of some of the cheapest countries but there are some other costs too. For example, there are entry fees, shopping costs, etc. But if you decide to do camping and hiking, there won't be any transportation or accommodation costs. So, it is you who has to choose your activities, tourist attractions you want to visit and then sum up the cost along with food, transportation and accommodation costs.