Welcome to the forum, barleyz! We have a Jacuzzi 365 as well, and LOVE it! What color shell/skirt did you go with? You will have to be sure to post pics after you get it installed. Waiting for it to arrive is the hardest part. :-/ There is a lot of good information on this board. I read a LOT on here while I was anxiously waiting for our tub to arrive! It's nice to be able to chat with others who are excited about their hot tubs as well.
As far as draining it on flowers/lawn, I agree with what H823Putt said. Don't add chemicals in the couple days prior to draining, and then you can watter your plants/flowers/yard without any ill effects. When I drain our tub, I have the main drain going, as well as a siphoned hose coming out over the top of the tub. It drains in no time flat!