DR just qualified to participate in the Athens Olympic Games in karate. We also have a Panamerican women's champ. There are many karate schools. When you come, just pick up the phone book and find the one closest to you and talk to the professors there for where you can watch the most advanced forms of karate. Regarding tai chi... there is a group that practices in the afternoons at the grounds of the St. George School. Call them to find out the schedule. There was another group that practiced in the Club Mirador del Sur.