Hello! That's a wonderful choice of cities to visit in Morocco. Here are some detailed travel tips for your journey:

Best Time to Visit:
The best time to visit these cities in Morocco is during Spring (March to May) and Fall (September to November). The temperatures during these months are mild and pleasant, making it perfect for outdoor sightseeing.

Route and Accessibility:
You can reach Morocco by flying into Mohammed V International Airport in Casablanca, it being the largest airport in the country. From Casablanca, you can easily get trains to both Meknes and Fes. These cities have well-connected road and railway networks.

Accommodation and Booking:
Accommodation in these cities ranges from luxury hotels to charming guest houses and Airbnbs. I recommend booking your accommodation in advance, especially during the peak travel seasons. You can use online travel agents such as Booking.com, Airbnb or local travel agents for this purpose.

Clothing and Essentials:
Morocco can be quite warm during the day and cool at night. Pack light, breathable clothing for the day and a jacket for the evenings. Don't forget sun protection like hats, sunglasses, and sunscreen. A good pair of comfortable shoes is also recommended as you would be doing a lot of walking while exploring the cities.

Health and Safety:
Make sure to drink bottled water to avoid any potential stomach issues. Avoid eating street food if you have a sensitive stomach. It's advised to have travel insurance that covers health issues. Morocco is generally safe but as in any place, stay vigilant about your personal belongings.

Local Etiquette and Respect:
Moroccans are predominantly Muslim, hence, modest clothing is appreciated, especially in religious places. Try to learn a few words in Arabic; it could come in handy and is appreciated by locals. Respect local customs and traditions, especially during the holy month of Ramadan.