i believe FormZ is the best for individual objects (ie. a sailboat) but 3D studio MAX is a better program for likes scenes...say...a veiw in the forest...
Another option would be to look over the net for a model of a sailboat that has already be done then import it into bryce.There are alot of sites that have models of things that you can use for free.Plus there are tons of sites that if you pay have even more of a selection.