Uros is, in fact, a collection of 78 floating islands, each one made by the people who live on them. Each island has a name; we visited Tata Inti (Father Sun), an island with 5 families that was built 20 years ago. Marta, the local notary, gave us a demonstration of how an island is built and maintained, then talked about living on the lake. The primary activity is fishing but the women make tapestries that they sell to visitors. We visited another island that has two small restaurants, a small grocery store, and several artisan displays.
Day trips to the Uros Islands is possible but it is also bundled with an overnight trip that includes a stay on Amantani Island and a visit to Taquile Island.
The only criticism: we would have liked to visit at least one other, larger island, which may have been possible on a day tour but is impossible when there is a 3-hour boat ride to the next stop: Amantani.