Receiving such an award from everyone is the greatest honor.
若気の至りで、そんなことをしてしまった。
I did that out of youthful folly (lit. as a result of youthful excess).
至り and 極み both mean 'the utmost degree' in expressions like 光栄の至り／極み, but 極み is used more often in everyday speech while 至り sounds more formal and literary.
極致 refers to the ultimate, unsurpassed point of something (e.g. 美の極致), while 至り is specifically used in the fixed pattern ～の至り to describe an emotional or evaluative extreme.
Standard kanji form; used in formal and written contexts.
Noun form of the verb 至る (いたる, 'to reach, to arrive at'), meaning the point reached or the result.