The activities at Grande Vista are much the same as those at Cypress Harbour. I'd add, though, that there is a climbing wall on the beach at GV and the children's pool area at the newer pool area is much more interactive than the one at CH. For adults looking for a little pampering, there are some spa-type services, massages and such, available at GV.
We've enjoyed both of these resorts and find them consistently at the top of our Orlando area timeshare favorites along with the DVCs (we are at Cypress Harbour now and will be at Grande Vista next week). Both resorts have been undergoing refurbishment, though GV is a newer resort.
GV is a resort that I highly recommend, I hope that you enjoy it.
Dick Taylor