Absolutely! These Scandinavian cities are a beautiful blend of modernity and history. Here are some travel tips for your trip:

Best Time to Visit:
The best time to visit Stockholm, Helsinki, and Copenhagen is during the summer months of June to August when the weather is pleasant and conducive for sightseeing.

Route and Accessibility:
From the U.S., there are direct flights to all three cities. If you're traveling within Europe, train and bus routes connect these cities quite conveniently. Ferries between Stockholm and Helsinki, and Copenhagen and Oslo are also popular.

Altitude and Acclimatization:
These cities are located at sea level, so altitude sickness is not an issue.

Accommodation and Booking:
It is recommended to book accommodation in advance, particularly during the peak tourist season. There's a range of options from budget hostels to luxury hotels. Airbnb offers a lot of great local stays.

Clothing and Essentials:
Even in summer, temperatures can be a bit cool, especially at night, so bring a light jacket or sweater. Comfortable walking shoes are a must, as these cities are best explored on foot.

Health and Safety:
These cities are generally safe, but it's always a good idea to have travel insurance.
Local pharmacies can provide any over-the-counter medication you might need.

Local Etiquette and Respect:
Scandinavians are known for their politeness, so be respectful and aware of personal space. When visiting any churches or historic sites, be respectful, and keep noise to a minimum.
Remember, it's customary to tip around 10% in restaurants in these cities.

Enjoy your trip to these beautiful Nordics!