1.5m draft is fine. There are no cruising guides for the region, but you can get charts and get local advice while there. It's not to hard to cruise there and if you always move around on a low tide you can float off later if you go aground. As you get closer to the date of arrival you can PM me and I'll try to put together an information package for you. FYI, all Brazilian charts are available for free on line as raster charts, so if you use laptop charting you're all set to go.