Sure! Here are some travel tips for your trip to Chandigarh, Shimla, and Manali:

Best Time to Visit:
The best time to visit these places would be during the months of March to June when the weather is pleasant and perfect for outdoor activities. You might also consider visiting during winter (December to February) if you enjoy snowfall.

Route and Accessibility:
You can start your journey from Chandigarh which is well connected with road, rail, and air. From there, travel to Shimla and then to Manali. There's a regular bus service as well as taxis available between these places.

Altitude and Acclimatization:
The altitude at Chandigarh is 350m, at Shimla is 2200m, and at Manali it is 2050m above sea level. While not too high, if you suffer from altitude sickness, take necessary precautions. Hydrate regularly and take rest before you explore.

Accommodation and Booking:
These places are abundant with reputable hotels, resorts, guest houses, and homestays. A good practice is to book your accommodations and travel (if any) in advance, especially during peak tourist season to avoid any inconvenience.

Clothing and Essentials:
Pack according to the season. If you're visiting during the summer, light-weight clothes would suffice, but always pack a jacket or shawl as it gets chilly in the evening. During winter, heavy woolen clothing is a must. Don't forget to pack comfortable shoes for exploring the cities.

Health and Safety:
Carry a first-aid kit with basic medicines. Stick to bottled water and eat at clean and reputable places.

Local Etiquette and Respect:
Respect the local culture and traditions. Avoid littering and follow all guidelines mentioned at tourist spots especially the religious ones. Refrain from smoking in public spaces as Chandigarh is a smoke-free city.