The best time to visit the United States depends on your preferences and destination. Generally, spring (April to June) and fall (September to November) offer mild temperatures and fewer crowds in most regions. Summer (June to August) is peak tourist season with warm weather but larger crowds and higher prices. Winter (December to February) can be ideal for skiing in northern states but cold in many areas. Consider your specific destinations and desired activities when planning your trip.

Most foreign visitors need a visa to enter the United States, but some may be eligible for the Visa Waiver Program (VWP). Citizens of VWP countries can travel for tourism or business for up to 90 days without a visa, but they must obtain an Electronic System for Travel Authorization (ESTA) approval before travel. Check the U.S. Department of State website for specific visa requirements based on your nationality and purpose of visit.

Tipping is customary and expected in the United States for various services. In restaurants, it's standard to tip 15-20% of the pre-tax bill for good service. For taxi drivers, bartenders, and hotel staff, 10-15% is typical. Bellhops usually receive $1-2 per bag, and housekeeping staff $2-5 per night. In some cases, such as at coffee shops or takeout counters, tipping is optional but appreciated. Always check your bill, as some establishments include gratuity for large groups.

Yes, tap water is generally safe to drink throughout the United States. The country has strict regulations and monitoring systems in place to ensure water quality. However, taste and quality may vary slightly between regions. If you have concerns or a sensitive stomach, you can opt for bottled water, which is widely available. In rare cases, such as during natural disasters or in very rural areas, local authorities may advise against drinking tap water, so stay informed about local conditions.

Public transportation options vary by city, but many major U.S. cities have extensive networks of buses, subways, or light rail systems. Research the specific transit system for your destination city online. Most cities offer reloadable transit cards or mobile apps for easy payment. Google Maps and other navigation apps can help you plan routes and provide real-time updates. Be aware that public transportation may be limited in smaller cities or rural areas, where renting a car might be necessary.