The Curt trailer hitch # C11212 attaches to the frame of the 2003 Honda S2000 in 2 places and to the trunk pan in 4 places. I have linked the installation instructions that show this. This is the only hitch available for your S2000.
If you want to use the hitch for an accessory such as a bike rack or cargo carrier then you have to make sure the accessory is rated for use with a Class I trailer hitch. Also, with a bike rack, you are limited to 2 bikes maximum on a Class I hitch.
Curt also... view full answer...