Cook the angel hair pasta according to package instructions. Drain and rinse under cold water to cool. Set aside.
In a large bowl, combine the cooked pasta, red bell pepper, cucumber, carrots, snap peas, green onions, and cilantro. Toss gently to mix.
In a separate bowl, whisk together the peanut butter, soy sauce, rice vinegar, honey, sesame oil, garlic, and ginger until smooth. If the dressing is too thick, add water one tablespoon at a time until desired consistency is reached.
Pour the peanut dressing over the pasta and vegetables. Toss until everything is well coated.
Chill in the refrigerator for at least 30 minutes before serving to allow flavors to meld.
Serve cold, garnished with additional cilantro or chopped peanuts if desired.