The chest contains 1800 gp.
It takes five days to journey from Sharn to Adderport by sea. During that time you learn that the crew of the Swiftwind is competent and able, but inexperienced at warfare; you realize that you are want for anything to do except train and practice your craft during the five days. The crew seem ok with this; perhaps they see your role as mercernery reserves, at the ready should the craft be boarded.
However, little happens along the way except that you once glimpse the shores of Zilargo for a time and the gnomes get a bit misty eyed for their homeland.
Ariving in Adderport, Sur'kil departs. He has research to do and would be no help on an expedition of this nature. However her knows that you will have questions and will want to contact him during your mission. To facilitate this he gives you two Sending stones. These act just like the spell Sending and are consumed during use. He asks in particular that you contact him via the stones should attain the items, or if you are turning back empty-handed.
The temple is roughly 160 to 200 miles from Adderport through the jungle. Sur'kil has crafted a map during the five days at sea, based upon modern maps of Korvaire and his research. Without mounts, you should be able to cover about 16 miles a day, so it should take you about 10 days or so.
Sur'kil will loan you ponies and horses, but any animal trained for war or anything other than simple riding you will have to purchase. With mounts you should move considerably faster: 32+ miles per day. The jungle is anticipated to be too difficult for mounts about 10 to 25 miles from the temple so you will need to make a semi-permanent camp and recollect them on your way back.
Unless you have further questions or purchases, you can strike out from Adderport whenever you are ready.