Sure! Portugal is a captivating country and your itinerary covers some of its most beautiful cities. Here are some travel tips to make your trip memorable:

Best Time to Visit:
The best time to visit Portugal is spring (April to June) and fall (September to October) when temperatures are mild and there are fewer tourists.

Route and Accessibility:
Lisbon is the main international hub. From Lisbon, you can travel to Sintra by train in about 40 minutes. To get to Évora, a train or bus from Lisbon takes about 1.5 hours. Guimarães is up north, closest to Porto, and can be reached by train or bus.

Altitude and Acclimatization:
These cities are not high-altitude destinations so no need to worry about acclimatization. However, the hilly landscapes, especially in Lisbon and Guimarães, require walking and climbing stairs.

Accommodation and Booking:
Booking accommodations in advance is always a smart decision, especially during the high season (July and August) when places can fill quickly. Every city offers options from luxury hotels to budget-friendly guesthouses.

Clothing and Essentials:
Comfortable walking shoes are a must due to the cobblestone streets. Check the weather before you go and pack accordingly. Don't forget a good sunscreen, hat, and sunglasses for the sunny days.

Health and Safety:
Stay hydrated, especially during summer. The tap water is safe to drink in Portugal. Always keep an eye on your belongings in busy areas as pickpocketing can occur.

Local Etiquette and Respect:
Portuguese people are friendly and welcoming. A basic understanding of Portuguese phrases will be appreciated. When visiting religious sites, dress modestly. Finally, don't forget to try their famous Pastel de Nata and Port wine while respecting the local culture and traditions.