Absolutely, here are some useful travel tips for your journey to Lisbon, Porto, Coimbra, and Braga:

Best Time to Visit:
The best time to visit these cities in Portugal is during spring (March to June) and fall (September to October). These periods offer pleasant weather and fewer crowds.

Route and Accessibility:
Start your tour in Lisbon, continue to Coimbra and then to Porto. From Porto, you can head towards Braga. You can use the train or bus service, which is reliable and offers reasonable prices.

Altitude and Acclimatization:
These cities are not located at high altitudes, so acclimatization is not a concern.

Accommodation and Booking:
Book your accommodations in advance, especially if you are traveling during peak seasons. All of these cities have a range of accommodations, from luxury hotels to budget hostels and vacation rentals.

Clothing and Essentials:
Pack a mix of clothing for warm and cooler temperatures, comfortable walking shoes, and don’t forget your swimwear if you plan on visiting the beaches. Do bring a lightweight jacket or sweater for cooler evenings or unexpected rain showers.

Health and Safety:
Hydrate often and apply sunscreen regularly, as the Portuguese sun can be intense. Stay vigilant and aware of your surroundings in crowded areas to prevent pickpocketing.

Local Etiquette and Respect:
Portuguese people appreciate politeness and courtesy. When visiting churches or other religious sites, dress modestly. Try to learn a few words in Portuguese, as it will be greatly appreciated by the locals.