Sure, I'd be happy to give you some travel tips for your visit to Binche, Brussels, and Aalst. These places are lovely, and each city has its own unique charm.

Best Time to Visit:
The best time to visit these cities is from May to September when the weather is pleasant. However, if you wish to experience the infamous Carnaval of Binche, plan your visit in February.

Route and Accessibility:
Both Binche and Aalst can be reached from Brussels via train. There are direct trains available, making these cities easy to access.

Altitude and Acclimatization:
All these cities are at sea level, so you don't need to worry about acclimatization.

Accommodation and Booking:
All three cities have a number of hotels and guesthouses to suit different budgets. It's advisable to book in advance, especially during popular events such as Carnaval.

Clothing and Essentials:
Pack according to the season of your visit. Summers can be warm, so light clothing is sufficient. However, the winters can be chilly, so warmer clothes would be required. An umbrella or raincoat would be useful as it frequently rains in these areas.

Health and Safety:
Stay mindful of your belongings, especially in crowded places. The tap water is drinkable in these regions. All three cities are generally safe, but as with all travel, it’s good to stay vigilant, especially at night.

Local Etiquette and Respect:
Belgians are quite reserved and polite. It's customary to greet with a light kiss on the cheek, starting with the left. Do respect the local customs and traditions, especially during Carnaval.

Hope you have a fantastic trip! Enjoy the beautiful architecture, local beer and chocolate, and of course, the Carnavals!