All of them are potentially correct depending on the context.
"To the best of my knowledge, the answer is cheese."
"And yet for all of my knowledge I was unable to answer him."
"I'm going for a ride on the bus."
"I'm going to the annual haunted hay ride."
The first one is more likely, as you'd generally go for a ride. Going to a ride would imply the ride is the final location you're heading to.
"He went to England to a Sales Conference." (He went to England, and went to the conference.)
"He went to England for a Sales Conference." (The reason he went to England is for the sales conference.)