<human>: Can you give me a shortened version of the text?

Hello all! 

I'm a longtime lurker, and love everything going on in r/travel. I'm planning a backpacking trip for a month in CA for May 2014. I'm looking to see where people have been in CA, and what they've loved and suggest.

I'm 24, female, and will be traveling with my sister (19). She's less experienced, but I've backpacked Europe a few times, the Carribean, the USA and Canada. I've got the Latin America Rosetta Stone, and I'll be working on that throughout the year. I am really hoping that we are able to hit some locations 'off the beaten track', and in smaller towns. I'm a bit of an..obessive planner, and I realize CA may break that habit as the lifestyle is much more relaxed; I'm excited for this, I need to chill out, haha. 

We start in San Jose, Costa Rica, and will be travelling up through Nicaragua. We are unsure whether we're going to do a 'loop' and come back to San Jose, or fly back (suggestions?). My priorities are history - ex: I'd love to see Tikal. My sister would love to scuba dive, and is interested in going to Roatan/Utilia; are these destinations worth it? 

So far, I have lurked around here on r/travel for ideas, and have also been checking lonely planet - as they seem to be the leader in terms of mainstream tourguide information re: CA.
<bot>: OP going to Central America for a month with little sister, and wants to experience as much authenticity/beauty/adventure as possible. Please share your favourite desintations/experiences/anything at all!