Waihe'e Falls

This is a relatively short but very rewarding hike.  It is very similar to Manoa Falls but way less busy.  It is in Kaneohe though, so it's further away from most hotels.  The trail is scenic and the waterfall at the end is tall and beautiful.  It's a great choice if you want to see an impressive waterfall.

Maunawili Falls Hike

This was one of my favorite hikes on the island.  It is about 3 miles round-trip through beautiful jungle, with an amazing waterfall and pool that you can jump into at the end.  This trail can get really muddy at times.  I actually thought it was fun when it was muddy.  You should bring towels with you to leave in the car for the ride home so you don't make a mess of the car.  There is not anywhere to wash off at the end.  If you can only do one hike, consider this one.  It is fun and rewarding, plus if you wear your swimming suit you can jump in the pool.

Kokohead Crater Botanical Gardens

The Kokohead Crater Botanical Gardens are inside the old volcano Kokohead.  There is a trail here that you can go all the way around as a easier hiking trail, or just go a little ways and see all the best stuff if you're wearing sandals or something like that.  I'd suggest taking a right at the fork after the plumeria grove and then continuing until you find the large cactus area if you want the shortened version.  There are lots of beautiful plants here, but just a word of warning, this botanical garden is not very well maintained and everything isn't always in bloom.  But if you want a nice walk through nature, or to say you've been inside a volcano, you can have a nice experience here.

Makapuu Tidepools

To get to the Makapuu Tidepools, you start up the Makapuu Lighthouse Trail.  When you reach a sign about whale-watching, follow the little side path that goes right behind that sign.  You will zigzag down the rocky hill to the ocean from there.  Someone has painted arrows every once in a while along the path to make it easier to follow.  It is pretty steep and makes for a good workout.  At the bottom, there is a blowhole that you can walk right up to as well as some large tidepools.  I didn't see much in there besides fish, but that seems to be how all tidepools are here in Hawaii.  If you want to see something unique and get a workout, this hike might be for you.

The hike back up

Makiki Trail Hike

The Makiki Trail is in beautiful Manoa Valley.  It has a variety of landscape along the trail and is lush and beautiful.  It is a loop trail, and we decided to go to the left first so that we'd take the steeper side going down instead of up.  Along the trail there were tons of strawberry guava trees and other fruit trees ripe for the picking.  This is a lovely hike and recommended if you want something a little harder than the easy hikes but still very enjoyable.

Taro plants

Crazy pink fluff

Don't forget to take a drive along Tantalus if you're in the area.  It's an incredible road with beautiful views of Waikiki and Diamondhead.

Kuliouou Ridge and Valley Trails

The Kuliouou Ridge and Valley trails are two trails that branch off from the same starting point.  The Valley trail is more green, and the Ridge trail has beautiful views.  The Valley trail is shorter and straightforward, while the Ridge trail is really long and kind of a maze.  I let Blake go ahead of me on the Ridge trail and we didn't find each other again until we reached the trailhead at the end.  My personal suggestion would be the Valley trail, but both of them are beautiful.
Valley Trail:

 Ridge Trail: