What are some essential tips for hiking across Iceland's diverse landscapes?

Some essential tips for hiking across Iceland's diverse landscapes include:

1. Be prepared for changing weather conditions by packing layers and waterproof gear.
2. Stay on marked trails to protect the fragile environment and prevent getting lost.
3. Carry enough food, water, and emergency supplies for the duration of your hike.
4. Inform someone of your hiking plans and expected return time.
5. Respect wildlife and follow Leave No Trace principles to minimize your impact on the environment.