I'll have four days/nights in Saigon later this month as part of a three-country holiday I've planned. I've already planned my flight in (BKK-SGN on VN) and out (SGN-REP on VN) and my hotel is booked (four nights at the Park Hyatt). Now I'm just looking for unique suggestions on how to spend my days. I'm NOT looking to overnight elsewhere, but day trips are fine. Specific interests - US military history (and I've done a LOT of scholarly study on the war during my undergrad and senior thesis), shopping (clothing, accessories, linens), cooking, art museums, cool cocktail lounges, and spa treatments. I am NOT a big fan of lots of touring (unless the subject interests me) and I don't want to do a ton of hiking (since I'll be doing that in REP on my next leg). What are some places or things I should consider? I've got a couple guidebooks stacked up but I'm looking for more "been there, done that" suggestions. Please help!