Although you can get yourself to Sacsayhuaman by taxi, having a knowledgeable guide makes it so much better. Our guide from Viajes Pacifico was so good I thought he was a history professsor. The tour company was very professional. They emailed and called in advance to be sure were were ready on time. The coach was cleana and cofortable. We had purchased the local tourist ticket that included two if the sites on this tour, so the guide helped us sell the extra tickets, as the tour also included entry. This tour also went to the Cathedral, Temple of the sun aka Coricancha and the water fountain. All were really amazing. Work out on the step machine before coming to Peru as it seems everything is up hill, and do not forget a light rain coat as it rains sporadically but not for long at least in spring. Happy travels.