Both kinds of orchids should be very easy to grow in Hawaii. Maybe just a bit more light. You can attach the plants to the eastern side of a tree so that they get early morning sun or pot them. Avoid situations with hot afternoon sun. The Dendrobium culture varies a bit according to type but without flowers it is hard to say which type you have. More precise info can probably obtained from the local orchid Societies in Hawaii.

I think I will give it until fall to see if I can't get a spike, and then separate them. It used to bloom twice a year, and I'd really like to see its flowers again! I've tried to identify it, but I think it's just a weird hybrid. The orchid was given to my boss when his father passed away. He kept it on the table in his office: a south facing, glass-walled room. Given the hours of direct sunlight it was subjected to, I have no idea how this little thing thrived. Sadly, my boss died unexpectedly two years ago, and his wife let me keep his orchid. You can imagine my panic when it nearly succumbed to the gnats! If I am able to successfully split it, I hope to give one to his wife; she has quite a few, but obviously this one would be special. :)

I agree with Ben, Vandas tend to loose lower leaves as they age. Those smaller offsets will fill in the empty space nicely. Also what you have I would call a basal shoot, which is slightly different than a keiki. I would consider a keiki as a growth off a flower stem or an old cane. The growth is coming off a " dead end " on the plant so removing it won't effect the main plant. A basal off shoot is growing off the main stem so removing it opens a wound on the main stem and could hurt the mother plant. I hope that makes sense.

Where do you live? What part of the World? You need to give this info to have us help properly. If you are in a summer climate, cut off part of the stem the keki is attached to. Pot the baby in some moist sphag. You can turn the plant so the roots find the moist sphag. The new leaves will adjust to the position. Once cut the roots need to find the moisture. Don't worry about the leaves, they will grow in the right direction. I like to leave a piece of the mother stem attached, but it isn't necessary. Put the baby in a bright window or outdoors (if in summer) to grow. Jane