Islas Palomino-activities-Lima and around

Hola!
I have some visitors next week and wanted some recommendations of activities to do in Lima.
For instance I was thinking in visiting Islas Palomino in Callao, does anyone know any good tour agency/package? how are the visits? is it nice? any special recommendation?
If you can recommend any other special activity/event happening next week/end let me know,
saludos