The Oleta River state park will surprise you. It has many interesting/extreme activites.
I will start with my favorite one, off-road mountain bike trails --
I was amazed, they have great trails for all levels, from novice to expert. There you can rent descent mountain bikes and all the gear you need. it is really cheap - the mapping is quite big which is a big plus all is well indicated and they provide a map too -- but be aware that it can get a little dangerous if you try black trails - make sure to stay on your level.
The Gilligan's island trail is the toughest but its a lot of fun for those advanced ones!!
the other cool activity is to rent kayaks and got through the mangrove canals to reach the bay, paddle to different islands, have a picnic, there is a cool sandbar just in the middle of the day also fun to for a swim but watch you kayak dont let it drift off !!
The park is well organised they have a nice beach, with possibility of BBQ. also fishing is possible.
If you looking for a fun day with the kids or want to challenge your friends on these trails then this is the place to be in miami!!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.