Hello, it seems like you're planning an exciting adventure to Grevenmacher, Remich and Schengen in Luxembourg. I'm more than happy to provide some travel tips to make your journey smoother.

Best Time to Visit:
The best time to visit these towns in Luxembourg is between May and October, when the weather is generally mild and enjoyable. The Wine Harvest Festival in Grevenmacher during September is a particular highlight.

Route and Accessibility:
Accessibility is relatively straightforward in Luxembourg. Regular train and bus services serve these three towns from Luxembourg City. To get the most out of your trip, consider renting a car for a more flexible itinerary.

Accommodation and Booking:
From hotels to guesthouses, accommodation options are plentiful in these towns. It's advised to book in advance especially during the peak summer months and festival periods. Websites like Booking.com and Airbnb offer plenty of options.

Clothing and Essentials:
The weather in Luxembourg can be unpredictable, so pack layers, a waterproof jacket and good walking shoes. Don't forget essentials like a universal plug adapter, toiletries and medicine.

Health and Safety:
Luxembourg is generally a safe destination, but it's always wise to have travel insurance that covers medical expenses. Also, be aware of your surroundings and keep your belongings secure.

Local Etiquette and Respect:
Luxembourgers are usually polite and reserved. A few words in Luxembourgish or French, like 'Moien' (Good day) or 'Merci' (Thank you), would certainly be appreciated. Respect local customs and etiquettes.