Shuttle vans are available from and to all the airports. There is a discount usually for several passengers going to the same destination. Reservations are suggested. The vans may make several other stops along the way to let off other passengers. Also, some drivers have a bad habit of cruising around the airport looking for additional passengers.
Taxis are available from and to all of the airports.
You can try to negotiate with the driver for a more modest amount. Taxis only make sense economically if you have several passengers. Your best bet is to reserve from home and get a vacation rate for the full week. It ends by turning into Arroyo Parkway. From there the Convention center is two blocks away on your right.