cruisett.com is a great tool! We have decided on CGB the 12th (we hit CGB last year with, unbeknownst to us, a Cruise Ship in, it brought tears to my eyes and we stayed for about an hour )and the Baths on the 17th.
BeerMe/sail2wind, I understand the logic behind mid to late afternoon visit, but we really like to spend the morning in the Baths and then lunch at Top of the Baths and cocktails Mad Dog.