Jeans/Pants for horseback riding. Skin suit for surfing/snorkeling. Flip Flops. Hiking boots if you want to visit Cabo Blanco
Toiletries and Medical Supplies: Sun tan lotion (the sun is strong), aloe vera for when you get burned, chap stick, swim trunks/suits x 2, sunglasses.
Miscellaneous: There aren't too many bugs in Montezuma but you will get bitten if you dont have any insect repellant