I had a character who started out robbed and dumped in the archipelago. The character started with no equipment, and so had to do with a stone axe and a stone knife on a small island (10 tiles?), with the start in "spring". As soon as the water was warm enough, as much time as possible was spent on swim training, allowing for excursions to nearby islands, and eventually a couple of kilometers could be covered, provided that the encumbrance was at most 1 (allowing for some clothes and a knife or a little food: a new [crummy] knife could be made fairly easily), and it was possible to bring some items from a nearby island (some food that didn't perish: good as a backup).
A very long swim led to a larger island than the starting one, with further islands within reach, and expeditions were made to those islands. Unfortunately, the water started to get cold on the way back from one of those, so the character turned back to the island just left (reasonably large), and started exploring it, to find that the original robbers were on that island! After killing a couple of them (see tactics above), a real axe was claimed, and luck allowed for an easy kill of an elk (i.e. food and cords), so a raft was quickly made. Using the raft, a shield recovered, maximum armor, and lying down on the raft to reduce the profile, it was possible to get the robbers to exhaust their arrows when out of physical reach, wait for them to run themselves into the ground, and then kill them with recovered arrows (with at least one surprise return of fire when one of the buggers claimed arrows from a downed colleague).
When all robbers were dead it was time for a trip to the original island to pick up some gear, and then to the mainland for a permanent settlement.
The character was eventually one-shot-killed by a bow wielding Njerp on an attempt to engage it from a large, but not sufficiently large, distance...