Sure! Visiting Cambridge, Oxford, and Bristol will give you a wonderful exploration of the UK's rich history and culture. Here are some travel tips to enhance your experience:

Best Time to Visit:
The best times to visit these cities are usually during spring (late March to June) and autumn (September to November). This will avoid the huge summer tourist crowd and you can enjoy the beautiful scenery during these seasons.

Route and Accessibility:
All 3 cities are fairly accessible as they are well connected by train and bus services. You can start from London. From there, the train to Cambridge usually takes around an hour, same with Oxford. It takes around 1.5 hours to travel to Bristol from London.

Altitude and Acclimatization:
These cities are not located at altitude, so acclimatization is not necessary. However, be prepared for lots of walking as the cities are best explored on foot.

Accommodation and Booking:
There are plenty of accommodations available in each city ranging from budget hostels to luxury hotels. It's always a good idea to book in advance to secure the best rates and availability, especially during peak seasons.

Clothing and Essentials:
As the British weather can be unpredictable, it's advisable to carry an umbrella or raincoat. Comfortable walking shoes are a must as there will be quite a bit of walking. Always keep a copy of the local map as these cities have many winding lanes.

Health and Safety:
These cities are safe but it's advisable to take standard precautions. Always keep an eye on your belongings, especially in crowded places.

Local Etiquette and Respect:
British people greatly respect queues and waiting turns, always remember to follow this etiquette. Also, tipping is pretty standard in restaurants if the service charge isn't included in your bill.

Enjoy exploring the beautiful architecture and scenic beauty of these historical cities!