If you are looking for other tours not related to horses you can visit Rebecca Adventure Travel for the best tours in Ecuador.
DAY TOURS FROM QUITO
Shared tours to Cotopaxi, Quilotoa, Otovalo, Mindo and Papallacta (55 USD pp)
Biking at the Cotopaxi
Private tours to all destinations around Quito; Mindo (canopy, biking, hiking), Papallacta (hot springs, biking, hiking), Mitad del Mundo (equator, museum, and Pululahua crater), Otovalo (indigenous market, Cayambe and visit Cuicocha Lake), Quito Old Town (visit Plazas, Basilica, Panecillo and market)
Papallacta Hot Springs
Ecua Horse Rides 