Certainly! Visiting Namur, Dinant, and Liège in Belgium can be a great experience. Here are some travel tips to make your journey enjoyable and hassle-free:

Best Time to Visit:
The best time to visit these places is during the late spring and summer months (May to August) when temperatures are warm and the cities host several outdoor festivals and events.

Route and Accessibility:
All these cities are easily accessible by train or car. If you are travelling from Brussels, there are regular trains to Namur (approximately an hour), Dinant (90 minutes), and Liège (just over an hour).

Altitude and Acclimatization:
As these cities are at low altitudes, there's no acclimatization required. However, some of the attractions in these cities like the Citadel in Namur does involve climbing, so moderate fitness is recommended.

Accommodation and Booking:
All these cities have plenty of accommodation options ranging from luxury hotels to budget hostels. Booking in advance is advisable, especially during the peak tourist season.

Clothing and Essentials:
Pack comfortable walking shoes as these cities are best explored on foot. Carry a light raincoat or umbrella as rain showers are frequent in Belgium.

Health and Safety:
Belgium offers high-standard health care facilities. However, carrying a basic first aid kit might be helpful. Also, tap water is safe to drink in these cities.

Local Etiquette and Respect:
Belgians are generally polite and formal. Always be respectful to the local customs and beliefs. Flemish and French are the main languages spoken here, but most people also speak English. A simple "Bonjour" and "Merci" can go a long way.
Try to respect the local quiet hours, especially in residential areas.