Snowbird sites where you can grow vegies/flowers?

A lot of snowbird parks let you get pretty elaborate with patios and such (not all but a fair number).

They may not like the idea of you tearing up the ground and installing permanent raised beds in case you leave and they have to remove them but a couple of nice rectangular planters could probably be put in.

Because of the nature of these parks, most have clearly outlined rules for what you can do and how it is approved. Call around to some of the parks in the area as they will have the final say.