In tourist information center you will find a large number of suggestions for excursions. Coordinates: -33.420288, -70.606854. The mass of proposals for tours and not only can be found on the websites:
Bikes for rent free on bail issued passports. There is no guarantee that it works for all foreigners. Thare are usual bike rentals. The first 30 minutes are free. An hour fare 1,5 USD = 1000. CLP Terms available at the website: bikesantiago.cl
Searching for a pleasant and at the same time affordable housing is not the easiest thing in Santiago. One way is to rent apartments in the buildings (two nights). Prices are quite democratic 38,1 - 48,9 USD = 35 - 45 EUR per night for a studio. Search through the standard booking systems.