Certainly! Remich and Grevenmacher in the Schengen Area of Luxembourg are perfect places for a peaceful and natural retreat. Here are some travel tips for your journey:

Best Time to Visit:
The ideal time to visit Luxembourg is between May and September when the climate is warm and outdoor activities are delightful.

Route and Accessibility:
The Luxembourg airport and railway station are well connected to the rest of Europe. Frequent buses and trains are available to Remich and Grevenmacher from Luxembourg city.

Altitude and Acclimatization:
Luxembourg's terrain is mostly made up of gently rolling uplands with broad, shallow valleys. Therefore, there is minimal risk of altitude sickness in Luxembourg.

Accommodation and Booking:
Luxembourg offers a wide range of accommodation options. However, it's better to book accommodation in advance, especially during peak tourist seasons.

Clothing and Essentials:
Carry comfortable casual clothing and walking shoes for daily sightseeing. It is slightly colder in the countryside when compared to the city, so pack a light jacket as well. An umbrella or raincoat may come in handy as it can rain quite often in Luxembourg.

Health and Safety:
Luxembourg is known for its high standards of health and safety. Tap water is safe to drink, and medical facilities are excellent. In case of an emergency, call the European emergency number, 112.

Local Etiquette and Respect:
Luxembourg is a multicultural and multilingual country. English is widely understood and spoken. The local people appreciate it if visitors try to use a few basic phrases in Luxembourgish, German, or French. The Luxembourg people are generally polite, and good manners are appreciated.

In restaurants and cafes, a service charge is usually included in the bill, but it's common to round up the bill for good service. In Luxembourg, tipping is seen as a reward for good service rather than an obligation.

Lastly, enjoy the beautiful landscapes, historic sites, rich cultural heritage, and warm hospitality that Luxembourg has to offer, and I'm sure you'll have a memorable trip!