tlsmikey,
I may be a little late as it looks like you were here this past weekend. There are only 2 locations for clay courts in the SLO area. There is one green clay that is owned by the Jewish Community Center and you have to be a member to play. The other is two red clay courts in Pismo Beach which I think is the one you are talking about. I don't think any hotel owns them but a tennis group. I am not sure how old this contact is but I believe you can rent them for a fee. Here is the number (805) 773-1891. We have filmed a couple commercials there. Next time you are in SLO stop by and say hi!
Thanks,
Brittany, TW