How about a one dayer:

Leave from the dike, where the usual crowd can watch out for our vehicles.

Out the jetties, south to San Luis Pass, under the bridge, back up West bay, under the I-45 causeway (I think we'll clear that one!), and back to the dike. That should take about 7-9 hrs, maybe less. Leave in the am, gets dark at 8:30 now.

Hell, by july 4ish, my knee may be up for it!