Interesting idea! Definitely could be useful, as others have said, once you get enough listings. Some design/UX feedback to think about if you do decide to take it further:

- First, biggest problem: I visit the site and I have no idea what it's for. The name doesn't help in this respect. SplashActive makes me think of some sort of aquatic physical therapy for the elderly. Consider changing the name, but even if you don't, have a big, visible, prominent explanation (at least for first-time visitors) that's easy and fast to read and that explains exactly what I can get from the product.

- The individual listing template is a major weakness. Functionally, the information you've included on the bottom line of each listing is very hard to read because the only thing separating the labels from the values is that the labels are bold. If I were searching for just the phone number, for example, it would be somewhat annoying to find it. Aesthetically, the listings feel extremely bare and boring, and I'm demotivated from continuing to read them. Definitely incorporate photos wherever possible, and make each listing larger. I would group the information currently running along the bottom into a vertical list, with the labels much more clearly differentiated from the content, and the description a smaller, tighter paragraph that doesn't stretch so long.

- Provide some feedback when I mouseover the title of the listings that reenforces that they are links.

- I agree with the comment that suggests removing the advertising bar. Not only does an empty advertising bar make you look weak/amateur, you already have a built-in revenue model that doesn't rely on regular advertising. Paid featured listings are more valuable if they are integrated into the site and just made more prominent. If they're set aside in a sidebar that we're trained to ignore, they don't work as well and you can't charge as much for them. They also dilute the experience of the site.

- More padding in most of your tables. It looks awkward when text is jammed up against the border of a box

- Maybe it's more popular in the UK, but Bing Maps looks pretty awful. I'd switch to Google Maps.

- My city shows up as a link on the front page in default blue, directing to what looks like a profile page even though I haven't made an account. Change the link color, and maybe prompt me to register or login if there's no session. Also, fix the spacing on this profile page, and hide the "My Activities" label if there's nothing there.

- While you're still getting started, why not post a message to users who are sufficiently distant from where you are saying that you're currently testing just in this market, and that if they want to request a new area for you to offer your service, they can leave the suggestion and their email to be notified. You can also redirect them to a portal for your town so they can see what the service is and what your offerings are. It's strange, right now, to see a big listing of things 4000 miles away.

- Put another link to register on the login page.

- Make the logo a link to the home page.

- The green color you're using is very subdued and moody for what you're doing. I like the idea of green, but choose a palette that feels active, energetic, and positive. Dark forest green, grey, and white don't say "fun in the sun."

- Eventually, you'll want to break things up into at least a few categories. Right now, it's not clear what makes something a "Top Activity", and the only other sorting option I have is to see what's recently been added, which doesn't seem that helpful either. Think through what someone using the service to find an activity will be thinking about and using to make their decision. Facilitate their search and make it as fast and easy as possible.

Keep up the good work!