Can you sleep on Isla del Sol?

Yes, you can sleep on Isla del Sol, and there are a bunch of stays available, from basic, locally run hostel-style spots to more pleasant eco-lodges. Most of the places to stay seem to gather around the southern village of Yumani, so you can catch some really striking sunset views over Lake Titicaca. It stands out a lot; it feels memorable.

It is also quite recommended to spend the night there, because after the daytime tour boats leave, the whole island turns far more tranquil. There is no motorised transport on Isla del Sol, so to reach many guesthouses you will need to trek up those ancient Inca stairs, which is why packing light, with a lightweight backpack instead of heavy luggage, is highly recommended.