Please note important clarification. Thanks to comment from Plefton: The information is about roads near CSU Channel Islands, which is many miles over land and water from the actual Channel Islands.
Desert USA has the following wildflower report for the CSU Channel Islands 2/25/13
CSU Channel Islands had lots of grape soda lupine (the ones that don’t smell) as well as some poppies along side the main road. Also saw a lot of this purple/pink bunches of these flowers in twisties of Grimes Canyon road between Moorpark and Fillmore, California.