Absolutely! Here are some travel tips for visiting Copenhagen (Denmark), Stockholm (Sweden), and Oslo (Norway):

Best Time to Visit:
The best time to visit these Scandinavian cities is from May to September when the weather is warm and daylight hours are long. However, if you're keen to experience the 'Nordic Winter', then visit between December to March.

Route and Accessibility:
All three cities are well-connected by train, flight and ferries. Start your journey with Copenhagen, move to Stockholm and finally visit Oslo.

Altitude and Acclimatization:
These cities are at sea-level, so altitude sickness is not a concern.

Accommodation and Booking:
Accommodation in Scandinavia can be quite expensive. It's recommended to book in advance. Airbnb, Hotels and Hostels are all widely available.

Clothing and Essentials:
In summer months, typical European summer attire is appropriate. However, it can still get chilly during the evening, so carry a light jacket. In winter months, heavy winter attire (thermal underclothes, thick jackets, gloves, scarves, and hats) are a must.
Always carry a universal adapter, Scandinavia uses Type F sockets.

Health and Safety:
The tap water is safe to drink in all three cities. Healthcare facilities are of a high standard but can be expensive if you're not insured so ensure you've covered.

Local Etiquette and Respect:
Scandinavians are known for their good manners and respect for personal space. They are generally fluent in English. Tipping is not mandatory but appreciated for good service. In terms of dress code, people tend to dress stylishly but modestly.
Follow regular COVID-19 safety guidelines and regulations.