Apparently I mistakenly packed for a months-long, multi-climate expedition rather than a couple of weeks in hot & casual Costa Rica. Lots - but not all - of the weight is in books I need while here but will be in no rush to receive back in the US. To avoid excess baggage fees on the return, I wonder if it would be cheaper to ship/mail stuff back. Nothing but the books is larger than a shoe box, and the "slow boat" is not a problem. Also, I can divvy up the stuff into many packages if that would help minimize the cost.
I'm in Santa Teresa now, so I'd be sending from around these parts.