Santo Domingo: City guide/Horseback riding equipment store?

[Tibu]

Hola,

I am looking for a giude in the capital who will take a friend of mine around the city while I am doing other stuff. Should speak english (or german) and be very reliable. Phone number for contact would be very welcome.

I am also looking for a place to buy horseback riding equipment, like boots, pants, saddle, rein etc.

Thank you for your help

Tibu