San Cristobal is the island with the capita of the Galapagos and is the third biggest. It is not as commercial as Santa Cruz but it has beaches, hiking and places to drink and eat after work. You will stay 5kms out of town in a hostel with plain shared rooms and good food. Taxis into town are easy to get and there are many options for weekend activities on this island or on others. You will have a cross section of experiences covering sea lions, iguanas, petrels and giant tortoises. There is weeding, attacking blackberry and lantana with machetes and gathering otoy for the tortoises. We also painted a mural at a school.It’s a well supported project, and better than others whose volunteers I spoke to. You’ll feel safe and there are people of other nationalities and ages to share free time with.