Wash and trim snow peas. Place them in a bowl and pour in enough boiling water to cover them. Let stand 10 minutes; drain and set aside. Cook the noodles in plenty of boiling water for 3 to 4 minutes. Drain in colander, rinse with cold water and set aside. In large bowl, combine noodles, snow peas, red pepper, cucumber, shrimp and crabmeat. In a small bowl, combine ginger, garlic, sesame oil, pepper, salt, vegetable oil, lemon juice and vinegar. Pour this dressing over the other ingredients and mix thoroughly. Chill before serving.