I plan on spending the summer in Hawaii wwoolfing around, but I also hope to do some backpacking while I'm there, so the question is, do I really need a regular sleeping bag for this? I have a mummy bag that is good up to 40 degrees, but that just seems a little much. I also have this big green coleman sleeping bag insert that is made of fleece, but that almost seems to flimsy.

Any thoughts or experience on this?

I realize that different places will be different temperatures, but I'm looking for a general guideline. Are there any particular bags you would suggest?

Thanks!