Since I'm grasping at straws for entry ideas, I thought maybe I could write about some things to do in Hawaii. I get this question more than I thought I would on Tumblr.
One great thing to do here is hiking! If you're vacationing, this is not always practical because you have to bring/buy clothes especially for this activity, but if the weather is good and this is the kind of thing you're into, I definitely suggest it!
I'm not super active/physical myself, but you can really go at your own pace for hiking. Yelp is also a great resource for hike suggestions. Just type in the name of one of these (or any that you hear about) and it will tell you the difficulty level (whether it's good for children or pets and things like that) and other reviews from people will come up!
Here are a few photos from hikes that I've been on. Sadly, I rarely get to photograph the whole of the hike because I don't want to put my DSLR at risk! There is often quite a bit of mud or dirt and sometimes even water features that you have to navigate. I'd rather complete the hike with my camera in tact, so I don't keep my camera hanging from my neck the whole time and I can focus on getting my body to do what I need it to do (lol) without worrying about damaging it.
Anyway, hopefully these photos will kind of give you an idea of what a few of these locations are like!
Makapu'u (Light House Trail) (and Tide pools)
Koko Head stairs
Wa'ahila Ridge Trail
Diamond Head is one of the most popular and easiest "hikes" to do - basically just a lot of walking and you probably don't even necessarily need sneakers. I haven't been on the trail in recent memory (it's more of a tourist thing), but I had an internship in the area while I was still in school, and we were able to go on a restricted area of Diamond Head so here's a few pictures from that! (If you're visiting though, you'll get a different view.)
Wiliwilinui Ridge Trail
I've also been to a few other places - Kuliouou, Mariner's Ridge, Maunawili, Pillboxes and a few others - but I can't find good pictures for them/my photo organization sucks/I didn't take my camera out because it was raining or super dirty when I went! I'm always grateful for the mental pictures and memories I took though because if I wasn't worrying about my camera, I was probably focusing on the hike and staying alive lol.
I think the good thing about most of these hikes is that if you get tired, you can stop and turn back at almost any time so people of all levels can do at least portions of these and still get a decent view. I haven't been hiking in awhile because I've been busy and most of these locations are far from my house, but I hope I can get back out there soon!