we LOVE vero beach. we always stay for 3 or 4 days before disney! june is great, 90's, but you have the beach and pool and lots of shade to cool you down, they have a fun dj by the pool with games conducted by the staff for the kids (and adults too!) i know they had poolside twister, tug-o-war, and a dance-off one day. they have a great restaurant, shutters, and a publix really close to property so if you forget sunscreen or whatever, its about 5, maybe 10 minute drive or so? theres also a little pizza place nearby that we discovered last time, its in a cute country-clubish neighborhood called orchid or something? and almost all the buildings are pink!
i hope you have a great time at vero beach!