Bay seniors who would prefer to find inner serenity in an environment that is less enclosed and sweaty than in their local studio are reminded that starting April 2 there will be light yoga sessions in the San Francisco Botanical Gardens in Golden Gate Park. They will take place on the green, green, green Conifer Lawn. You can make a regular routine of it. Classes will be held every first and third Tuesday (6pm) and Saturday (10 am). Suggested donation $10. Anyone know of other alfresco yoga classes?