Meaning of ハイ in Japanese

Can you tell me how I should get to Hyde Park?

It was so nice a day that we went for a hike in the mountains.

I met some hikers on the mountain.

The hijacker demanded a ransom of two million dollars.

The hike will take no less than eight hours.

Oh, now I feel the wind blow hi, hi, hi, hi.

This road joins the highway there.

For you who love adventure, this kind of hiking will meet your need.

It being fine, we went hiking yesterday.

Forming an information infrastructure, the real impact of the information highway is an expectation of new economic development due to a shift from a tangible hardware-industry to brain-oriented software-industry.