I would suggest renting them over the the Poly or Contemp. The lake is much bigger and I think it would be more fun to zip around. We rented them at CSR and were bored b/c you could only do small circles on the lake before you ran out of room. JMHO!
And they're very easy to operate. I think AP holders can get a 10-15% discount on the rental (at least, we did back in 11/2002)