There are a series of Mexican symbols that don't look right on the wallpapers of Mexican restaurants, including peppers, guitars, cocktails, cactus, tacos and our three Mexicans themselves.
Use the plus and minus signs in the lower left corner to adjust the basic bet from $0.01 to $5.00, then you can use the "Bet One" button to select the bet level; this will effectively double the base bet, so the highest price becomes $10. Two betting levels mean two pay levels, so the reward for landing in Tres Amigos is 1200x or 2500x for your bet.