Susie, I vote for the dress! I say that 'cuz I've already introduced my knee to world at large many times over 'cuz I'm proud of this still, quite ugly scar. I earned it and am still earning it every day, as are you. If there ever was the weather or occasion for a dress, this is it doll! Rock it!

Besides, think of the cute shoes you can wear with the dress and they won't be hidden by pants....gotcha there, eh?
Ah, "Fear of Gym Bunnies" is a well documented phobia. I chose a very geriatric gym with pool many years ago for just that reason. I was 50 pounds overweight at the time and there was no way I'd be wearing a bathing suit around the fit and perky 20-30 somethings. Nope. It really worked well for me and I'm still a member. There really are gyms that attract us...er... *vintage* people and some are women only if that's an issue. Smaller facilities are usually better. However, if swimming isn't a dream exercise, I vote for the great outdoors! I'm not a fan of gym machines and much prefer to see some sights or greenery, on a bike or on foot.
@Polkadot, careful with the Stockholm Syndrome! We don't want to read about you on the front pages of some gossip rag, lol!