Hello! It sounds like you're planning an exciting trip to Fethiye, Kas, and Olympos. Here are some insightful travel tips for you.

Best Time to Visit:
The best time to visit these coastal towns in Turkey is between April and October, when the weather is relatively warm and pleasant. However, for less tourist crowds and relatively inexpensive accommodations, consider visiting during the shoulder seasons of April-May and September-October.

Route and Accessibility:
The easiest way to reach Fethiye, Kas and Olympos is by air. The nearest airport is Dalaman International Airport for Fethiye, and Antalya International Airport for both Kas and Olympos. From the airports, you can hire a taxi or take a direct bus. Alternatively, if you're comfortable driving, you can explore car rental options.

Accommodation and Booking:
Booking online through trusted travel or hotel booking sites is usually the most convenient way to arrange accommodations. Fethiye, Kas, and Olympos offer a wide range of accommodations to fit different budgets from cozy guesthouses, hotels to luxury resorts. It is highly recommended to book in advance especially during the peak tourist season.

Clothing and Essentials:
Pack breathable, light clothing for the day and some warmer layers for the cooler evenings. A hat, sunglasses and sunscreen are musts, as well as comfortable shoes for walking and exploring. Also, don't forget your swimming gear if you plan on enjoying the beautiful beaches.

Health and Safety:
It's generally safe to travel in this region, but as with any destination, it’s important to take basic precautions. Make sure you have adequate travel insurance, keep your valuables secure, and stay hydrated, especially during hotter months. If you're planning on hiking, carry a map, first-aid kit, and adequate water.

Local Etiquette and Respect:
The Turkish people are generally warm and hospitable. It's respectful to greet people with 'Merhaba' (hello). Remember to dress modestly, especially in religious sites. Tipping is customary in restaurants, cafes, and hotels. Do learn a few Turkish phrases to connect better with the locals.