Of course! I'll be glad to provide some travel advice for your trip to Esztergom, Visegrád, and Szentendre in Hungary. These are beautiful locations full of history, culture and scenic beauty. Here are some tips:

Best Time to Visit:
The best time to visit these places is from April to September when the temperature is mild and the weather is generally pleasant.

Route and Accessibility:
All three locations are conveniently accessible from Budapest. You can rent a car or take a bus or train. Cruises along the Danube river are also available.

Altitude and Acclimatization:
These places are not at high altitudes, so typically acclimatization is not a concern.

Accommodation and Booking:
Esztergom, Visegrád, and Szentendre have a good range of accommodation options ranging from luxury hotels to homey guesthouses. It is recommended to book your accommodations in advance, especially during the peak summer season.

Clothing and Essentials:
Layers are essential as temperatures can fluctuate. Comfortable walking shoes are a must as there are lots of interesting sights and attractions to explore in these towns.

Health and Safety:
Generally these towns are safe, but basic precautions that apply everywhere should be taken. Carry a basic first aid kit and any necessary personal medication.

Local Etiquette and Respect:
Hungarians are generally polite and respectful. Learning a few basic Hungarian phrases can be greatly appreciated by the locals. Respect local customs, especially when visiting historic sites and churches.

Remember to try the local Hungarian cuisine when in Szentendre, and don't miss out on the beautiful views of the Danube Bend from Visegrád! Enjoy your trip!