There are quite a few trails for hiking in or around Chapala and Ajijic. There is a trail right at the hills here where you can see the airport from the top. Hiking in Ajijic's Oak Forest is a real climb and would take about four to five hours to get to the peak.
If you go to certain towns like San Juan Cosala, there are trails that go up a little ways, but not too far.
Hiking in Chapala and Ajijic is more interesting than hiking in Southern California because you go off the beaten path and would be surrounded more by nature. The trails are not fixed like in Southern California where everything's mapped out for you and where you would be told, "Here's the trail. You should go here and here."
I lived in Mexico City and also did some hiking there, which is also nice. However, when the trail is all mapped out exactly for you, it somewhat loses the adventure appeal.
There is not a lot of outdoor camping in the Chapala and Ajijic area. One of the reasons is that a lot of people are concerned about crimes. Boy Scouts have come to camp in this area, but I haven't heard a lot of wilderness camping out here in the towns. Camping is probably better when you get to the top of the hills because you'll be more secure there.
There are a few campsites. One is called Roca Azul, which is a very nice campsite. Generally speaking, Mexicans do not go camping.
You wouldn't want to pull a trailer because it'll be rough due to the potholes on the roads. Bringing a motor home is possible, but there are not a lot of places to pull over and park. In the States, there are a lot of areas where you could pull over and park your motor home, but not here in Mexico.
(Camping at Roca Azul, on the shores of Lake Chapala near Ajijic, Mexico, pictured.)