The best time to visit Portugal is during the spring (April to June) or fall (September to October) when the weather is mild and pleasant, crowds are smaller, and prices are lower. Summer (July and August) is the peak tourist season with warmer temperatures and more crowded attractions, while winter (November to March) can be cooler and rainier but offers fewer tourists and lower prices.

Citizens of EU countries, as well as those from the United States, Canada, Australia, and many other nations, do not need a visa for stays up to 90 days within a 180-day period. However, it's always best to check the current visa requirements with the Portuguese embassy or consulate in your country before traveling, as regulations may change.

Some of the must-visit destinations in Portugal include Lisbon (the capital city known for its historic charm and vibrant culture), Porto (famous for its port wine and picturesque riverside), the Algarve region (renowned for its beautiful beaches and golf courses), Sintra (a UNESCO World Heritage site with stunning palaces and castles), the Douro Valley (known for its wine production and scenic landscapes), and the Azores islands (offering unique natural beauty and outdoor activities).

Portugal is generally considered a safe country for tourists, with low crime rates compared to many other European destinations. However, as with any travel, it's important to exercise common sense precautions such as being aware of your surroundings, safeguarding your belongings, and avoiding isolated areas at night. Petty theft can occur in tourist areas, so keep an eye on your belongings and be cautious of pickpockets.

The local currency in Portugal is the Euro (€). Credit cards are widely accepted in most hotels, restaurants, and shops, especially in urban areas and tourist destinations. However, it's a good idea to carry some cash for smaller establishments, local markets, or rural areas where card payments might not be available. ATMs are readily available in cities and towns for cash withdrawals.