There are many optional hiking routes at Detweiller Park. They're all good, but the choices on Saturday will be entirely up to the group consensus.
Weather forecast, from the perspective of one week out, is for a high temperature in the 40s with rain not until the afternoon. That said, the "just in case" fallback date is one week later, February 6.
PLEASE (ALWAYS) SEE THE COMMENTS FOR ADDITIONAL INFORMATION.