La Nariz del Indio, a mountain named after its resemblance to a Mayan's profile with a prominent nose, lies just NNW of town. It is now a national park with well maintained trails, informational displays, roofed miradores (lookouts) and a Q50 entrance fee. The entrance lies along the main road heading out of town towards San Pablo (clockwise around the lake). The entire hike in and out can be done in 3-4 hours easily. Alternatively, one can take a different route out the back towards Santa Clara la Laguna, then catch pickup trucks or tuk-tuks back towards San Pablo and then San Juan (Q10 each leg for Q20 total).
The church was built in the 15th century and is beautiful from the outside and inside. On the right-hand side you can see the Rostro Maya, mountains forming a lying face of an Indian in the distance.
Climb el mirador for a fantastic view over the lake. It is a 10-min climb up the same path as for la Nariz del Indio. No guide needed, a policeman is even at the plattform.
See a demonstration at Licor Marron on how cocoa is grown and chocolate is produced. They also have a shop where they sell handmade products.