Most tour operators leave from La Paz and spend at least one night in Copacabana or La Isla del Sol.
Crillón Tours. Beyond a few shorter tours, Crillon stands out for offering one of the most complete two-day tours, including Moon Island, Sun Island (where you overnight in their eco lodge), and Huatajata. They have a strong cultural, community focus with plenty of stops at small artisan markets and visits to local families. Av. Camacho 1223, Zona Central, La Paz, La Paz. 02/233--7533; www.crillontours.com. From $155 USD.
Turisbus. Leaving from La Paz, Puno, or Copacabana, Turisbus offers the standard two-day trip with time on Sun Island and Copacabana, overnighting at the Hotel Rosario Lago Titicaca, which has spectacular views over the bay. They also offers shorter, more independant full-day and half-day trips that can be taken from Copacabana. Calle Illampu 704, Zona Central, La Paz, La Paz. 02/279--8786; 02/245--1341; www.turisbus.com. From (Bs)490.