Travel guides by Nomadic Matt
Travelstart.co.za (online travel agent)
Hostelworld.com (for youth hostels, backpackers and motels)
HI USA (American Youth Hostels)
Deutsche Bahn (for train schedules in Germany)
STA Travel (online travel agent)
Tripadvisor.com (reviews and bookings)
Kayak.com (aggregator and search engine)
Priceline.com (online travel agent)
When to Book by Kayak
Lonely Planet Thorn Tree Forum (Tips and advice from fellow travelers.)
Your local friendly travel agent
It is sometimes argued that online travel search websites or price comparing websites will always give you the best deal – that is however not always true. Booking directly at the airline or hotel is sometimes still the best choice. For more insight read Why Bargain Travel Sites May No Longer Be Bargains by Doug Garr.
Many big cities (particularly in Europe) have city passes. The pass will have different options, but will give you access to museums and other attractions. The Berlin WelcomeCard is an example of such a pass.
Make use of different payment methods
Check for restaurant specials by using internet sites like Groupon.com
Make the most of your status as a student. Check all possibilities for discounted rates and freebies! (Remember to take your student card with you to qualify)
Remember to drink enough water to avoid dehydration
Get a map at the nearest tourism bureau
Make sure that the battery of your camera / phone is charged, or that you have a power bank on hand.
Wear comfortable shoes, that also keeps your feet dry when it is raining or snowing. (The Travel Shoes: Hers and His Edition by the Strategist)
Leave a copy of your travel itinerary with a friend
Don’t travel with all your valuables. Leave items that you will not need on the trip with friends or in a safe place.