I was only on POF (because I'm cheap!), DP was on there and also Match.
FWIW, I put up a photo where I wasn't looking my best, hardly any make up and scruffy hair, just to get on there and have a look before filling in my profile. I wrote "just window shopping at the moment, will fill this in later" in the profile. I had to wait 24 hours before I could hide my profile and within that time had 100 people 'want to meet' me (I presume that was just a click on a button) 
Now I'm no looker, I'm fairly average, overweight and didn't show any cleavage. But I was fresh meat and probably looked approachable.
Just a thought - maybe you're TOO attractive?! It might be putting people off? DP's ex recently talked about trying OD as she wanted to meet someone wonderful like he had 
. I was worried about her as she is slim, blonde, big boobs which she's happy to flaunt etc. and I thought she is looking for a relationship but she is just going to get bombarded by all the wrong people. She'd be better off putting a jumper on, taking her mascara off and being a bit more 'meh' !
Just going on what you've said here, horses and boats are not necessarily interests that Mr Average will feel like he can share in. Add in the gym and hiking, anyone who's not a fitness freak will now be panicking about you dragging him up a mountain! Coffee just shouts "bad breath" at me (I've just had one and I won't kiss DP until I've brushed my teeth!) so if I were a bloke I'd be thinking you're not for me, sorry. Just trying to give a subjective opinion.
It would be nice to meet a yacht owning, horse riding millionaire, but they're not hanging out on POF! Perhaps try to sound a bit more down to earth and sadly I think you will get more interest. Men can be delicate little flowers and like to think they're going to 'wow' you when they meet you. Reading about someone who likes boats and horses and travelling the world could be off-putting. It doesn't mean you should totally reinvent yourself, but perhaps just say less about yourself, retain some mystery and sound like you have room in your life for a partner.
I know that the correct answer is that you should just be yourself and if they don't like it, tough shit, but that won't get you dates, whereas once you've met someone you can build on the mystery a bit and they can find out more about you. Think of it like a movie trailer - if you tell them everything now you spoil the film. Give some highlights to lure them in, but save the interesting stuff for when you have them one-to-one.