By chartered boat from Yumani, walking or motorized from Copacabana. It should be possible to be rowed across to Isla del Sol, at 15 Bs pp. A motor boat costs about Bs 70 for a full group. Beware that some boatmen will try to charge you entry fees to the island. Don't pay unless you get a ticket freshly torn off a pad.

Tiny and walkable.

There is a restaurant.

And there is a hostal.

Walking the 17 km to Copacabana is quite spectacular, and you will mostly have the sun in your back going south.