Tourism is important to Vietnam for several reasons:

Economic Contribution: Tourism significantly contributes to Vietnam's economy by generating revenue, creating job opportunities, and stimulating growth in related sectors such as hospitality, transportation, and retail. The influx of tourists brings in foreign currency, supports local businesses, and boosts the country's GDP.
Cultural Exchange: Tourism fosters cultural exchange and understanding between Vietnam and visitors from around the world. It provides opportunities for locals to share their traditions, customs, cuisine, and heritage with tourists, while also allowing Vietnamese people to learn about other cultures and perspectives.
Sustainable Development: Responsible tourism practices can promote sustainable development in Vietnam by conserving natural resources, preserving cultural heritage sites, and supporting eco-friendly initiatives. By promoting environmentally-friendly tourism activities, Vietnam can protect its ecosystems and biodiversity for future generations.
As for the things I enjoy doing on holidays:

Exploring Nature: I love spending time outdoors, whether it's hiking through lush forests, relaxing on pristine beaches, or exploring scenic landscapes. Nature provides a sense of tranquility and rejuvenation, allowing me to escape the hustle and bustle of daily life and reconnect with the natural world.
Trying Local Cuisine: One of the highlights of traveling for me is sampling delicious local cuisine. I enjoy visiting local markets, street food stalls, and restaurants to taste authentic dishes that showcase the flavors and ingredients of the region. Food plays a significant role in culture, and trying different dishes allows me to immerse myself in the culinary traditions of the places I visit.
Learning About History and Culture: I have a keen interest in history and culture, so I always make an effort to visit museums, historical sites, and cultural landmarks during my holidays. Exploring ancient temples, monuments, and heritage sites helps me gain a deeper understanding of the local history, traditions, and way of life.
Now, let's discuss the negative effects of tourism on a region or country:

Environmental Degradation: Tourism can have detrimental effects on the environment, including pollution, habitat destruction, and depletion of natural resources. Overdevelopment of tourist infrastructure, such as hotels, resorts, and transportation networks, can lead to deforestation, erosion, and loss of biodiversity in sensitive ecosystems.
Cultural Erosion: Mass tourism can sometimes result in the commodification and commercialization of culture, leading to the loss of authenticity and traditional practices. Local communities may modify their customs, traditions, and way of life to cater to tourist expectations, which can erode cultural identity and heritage over time.
Social Disruption: Tourism can create social tensions and inequalities within communities, particularly in destinations where there is a large disparity in wealth between tourists and locals. Issues such as overcrowding, displacement of residents, and increased cost of living can strain local infrastructure and social services, leading to resentment and conflicts between tourists and residents.
Overall, while tourism brings numerous benefits to a region or country, it is essential to manage its negative impacts through sustainable practices and responsible tourism initiatives. By balancing economic growth with environmental conservation and cultural preservation, destinations can maximize the benefits of tourism while minimizing its adverse effects.