Tourism represents an important source of income. Most resource-poor countries, therefore, cannot afford to neglect the economic opportunities tourism offers. However, tourism often ends up destroying the landscape and culture that attracted visitors in the first place. Low-impact tourism is sustainable travel and leisure activities that directly benefit local communities. The society and culture and environment of the people who live in the tourist destinations are not damaged or destroyed either. Unfortunately, the environmental impacts of tourism can be devastating when profit takes precedence. As a result, it heavily depends on individuals travel responsibly as a "green tourist". Being a green tourist starts eating out on trips with a philosophy of "buy local, eat and drink local." Tourism expenditure within the destination can create induced benefits. Try not to go for the international fast-food chains, because most of the money from tourism may undergo leakage. Furthermore, food is an important part of the culture of a region, through its consumption gaining in-depth knowledge about the local cuisine and of the destination's culture. Choosing locally made souvenirs and presents is another area where the tourist can be either a help or a hindrance, but never buy anything that's made from an endangered species. Never pick any plants or flowers either. However, sometimes tourists behave very poorly while traveling. Therefore, the key factor in minimizing damage through tourism is to keep tourist groups to a management size and manage their movements and behavior. In fact, some popular attractions have tourist group size limit. For example, La Boqueria, the most famous market in Barcelona worldwide, banned tourist groups of more than 15 people in 2015.