According to forum posts, travelers recommend taking the Narita Express (NEX) train directly to Shinjuku, which is seen as convenient and efficient. Alternatively, the limousine bus service is mentioned as another option, providing direct transit to various Shinjuku hotels. The cost for the limousine bus is around JPY 3,000 for a small group, while the NEX is preferred for its speed and comfort.

Some users suggest using the limousine bus service from Haneda Airport to Shinjuku, which costs approximately 50 Australian dollars for three passengers. This service is favored for its direct route and ease of access to hotels in Shinjuku.

Travelers have noted that during peak hours or upon late arrivals, the choice between bus and train can depend on the specific time and traffic conditions. For instance, the limousine bus might take longer during heavy traffic periods, whereas trains like the NEX offer a more predictable travel time.

For travelers concerned about navigating large stations like Shinjuku with luggage, some recommend taking a short taxi ride from the station to their accommodation in Shinjuku, especially when traveling with family or large groups. This is seen as a way to ease the transition from the station to the hotel, particularly for first-time visitors.

According to forum posts, first-time visitors to Shinjuku should not miss exploring Kabukicho, often referred to as a mini Las Vegas, where a variety of restaurants can be found. The area is also home to the iconic Godzilla head and a hub for vibrant nightlife.

For a mix of modern and traditional experiences, travelers have suggested visiting the Samurai Museum and exploring the serene environment of Shinjuku Gyoen National Gardens. These spots offer a deeper insight into Japan's rich history and natural beauty within the bustling district.

Some travelers mentioned the importance of experiencing Shinjuku's shopping and dining scenes. The area around Shinjuku Station is highlighted for its plethora of dining options, including the famous Omoide Yokocho, which offers a variety of local street food and casual dining experiences.