Absolutely! Here are some key travel tips to make your visit to Barcelona, Valencia, and Alicante enjoyable and trouble-free.

Best Time to Visit:
The best time to visit Barcelona, Valencia, and Alicante would be from May to June when the weather is pleasant and perfect for beach activities. September to November is also a good time when it's less crowded.

Route and Accessibility:
All three cities are well connected by train, plane, and road. Coming from outside Spain, you are likely to land in Barcelona first, from where you can take a train or flight to Valencia and later to Alicante.

Altitude and Acclimatization:
As all three cities are along the coastline, there isn't much to worry about in terms of altitude and acclimatization. However, make sure to take precautions if you plan to hike in the mountains around these cities.

Accommodation and Booking:
From budget hostels to luxury hotels, all three cities offer a range of accommodations. It's advisable to book your accommodations well in advance, especially if you're traveling during the peak tourist season.

Clothing and Essentials:
Pack according to the weather. A good pair of walking shoes, beachwear, some light clothing for the day, and a light jacket for cooler evenings should suffice. Don't forget sun protection.

Health and Safety:
Avoid isolated areas at night, be cautious of your belongings, and stay hydrated, especially if you're visiting in the summer.

Local Etiquette and Respect:
Spanish culture prizes courtesy and respect. Spaniards are usually friendly and outgoing, so don't hesitate to ask for directions or suggestions. If you're visiting religious sites, dress modestly out of respect.

Remember to enjoy the local food and make the most of the lively Spanish nightlife. Safe travels!