Sure, a trip to Gangtok, Pelling, Yuksom, and Ravangla is an enchanting journey into the heart of Sikkim. Here are some travel tips to navigate your way through these destinations:

Best Time to Visit:
These parts of Sikkim enjoy a temperate climate throughout the year. However, the most picturesque time to travel can be during the spring months (March to June) when the rhododendrons are in bloom.

Route and Accessibility:
You can reach Gangtok via air through the nearest airport, Bagdogra. From Bagdogra, it's a 4 to 5-hour drive to Gangtok. For the other destinations, it's best to take rental cars or cabs. Do note these hilly areas can experience landslides, so speak to a local guide about the best and safest route.

Altitude and Acclimatization:
Each of these cities varies in altitude with Gangtok being the highest. Altitude sickness is unlikely, but in case you feel unwell due to altitude, be sure to rest and hydrate before continuing on your journey.

Accommodation and Booking:
Accommodations range from budget hotels, homestays, and luxury hotels. It's always prudent to book accommodations in advance via trusted travel or hotel websites.

Clothing and Essentials:
Carry warm clothing as it can get cold at night. Don’t forget to carry an umbrella or a raincoat, sturdy walking shoes and general essentials like mineral water, energy bars.

Health and Safety:
Remember that medical facilities might not be immediately accessible in these areas, so carry a basic first aid kit along with necessary medication.

Local Etiquette and Respect:
Show respect to local customs and traditions. Dress modestly while visiting monasteries or religious sites. Always ask for permission before clicking photos of tourist attractions, people, and at religious places.