Our upcoming trip will be 7 days long...but we won't really need a golf cart the first or last day. I was thinking of just renting a cart for 3 days, instead of the full 5 remaining days (don't think we'll really use it every day). Is there a per-day rental or would a 5-day rental be cheaper? Can you tell I'm trying to be frugal -- trying to make this cart fit into our budget? Thanks!