My minimum for Oahu is 6 nights, so no I wouldn't say that 7 nights is too much as long as its your base to explore Oahu. You'll definitely need a rental car to do that.
Personally, I'm not a fan of Waikiki beyond the "been there, done that" stop for a picture. Its way too touristy and close to sea side major cities for me but as you can see from the comments, some people love it. I actually like that Ko Olina is out away from the city. Feels more Hawaiian
Personally, I'm not a fan of Waikiki beyond the "been there, done that" stop for a picture. Its way too touristy and close to sea side major cities for me but as you can see from the comments, some people love it. I actually like that Ko Olina is out away from the city. Feels more Hawaiian