So there's an earthcache here that I've been interested in getting... It's the Tidal Earthcache by TAT

Now these caches are being retired at the end of the month. I've been watching the tide charts and it happens that a projected low tide on 12/31 at 5:06 +/- of -1.1. It's not the lowest, but it's one of the few that are that low and the only one that's a candidate before it's archived. If you're in the OOB area around that time, you might want to check it out.