This is my 1st trip to Hawaii. We will be in Oahu for 4 nights the end of Feb. 2014. We will not be renting a car. We are staying in Waikiki. Our flight arrives around 11pm and the next day we don't have anything planned but I would love to hike Diamond Head. Will it be too hot to do that in the afternoon? I think we could just take a taxi there??? I really have only 3 days and we are taking an all day circle island tour with Pearl Harbor one day and I would like to hike Diamond Head and snorkel Hanauma Bay. I'm not sure I could do both the 2nd day. What do you suggest?