Absolutely, I'd be happy to provide some tips for your upcoming trip to Dubai, Abu Dhabi, and Sharjah:

Best Time to Visit: The most comfortable time to visit the United Arab Emirates would be between November and early March when the temperatures are milder.

Route and Accessibility: All three cities, Dubai, Abu Dhabi, and Sharjah, are well-connected by roads. You can use public transport like buses or metros, but renting a car might be a more convenient option.

Altitude and Acclimatization: These cities are at sea level, so altitude sickness is not a concern. However, the heat can be extreme, especially between April and October, so make sure to stay hydrated.

Accommodation and Booking: There is a wide range of accommodations available in all three cities, from luxury hotels to more budget-friendly options. It's advised to book in advance to secure good deals.

Clothing and Essentials: Light, breathable clothing is advised due to the hot climate. However, it's crucial to respect the local customs and avoid wearing revealing clothes. Also, remember to pack sunblock, a hat, and sunglasses.

Health and Safety: Avoid excessive sun exposure, especially in the hotter months. Also, tap water is generally safe to drink but opting for bottled water might be a safer option.

Local Etiquette and Respect: The United Arab Emirates is a Muslim country, and it's important to respect their culture and religious customs. During Ramadan, it's prohibited to eat, drink, or smoke in public from dawn till sunset.

Keep these tips in mind, and you'll surely have an amazing trip!