As a business owner you will need to have staff at times even if you are small to make all the hours you need to be open successful. As a skatepark, this staff can languish behind the counter. Making sure that these people are fully working will allow you ensure the most work for your money.
1. Staff sales goals. Give your staff incentives to meet the sales goals you want. You can even have a fun competition on memberships, multiple punch entrance cards, camps, or lessons. Whatever you have to sell could be put into the goal. You don't have to just make it fun either, this could be a good tool for reviewing who is working well in this environment. If someone consistently doesn't make the goals, more training or another job could be called for.
2. Training. Staff needs to be brought in for training so they know what to do, when, and how to sell your stuff. You can go over areas needing work, or what weekly projects need to be done on the slower times.
3. Projects. All people like being part of a plan. Make a few projects. Have them plan an event start to finish, review it and give them feedback. If they are at the front desk have them file, fill out mailers, straighten, clean. Give them a work checklist.
4. Staff parties. Plan on having the staff out to a party to celebrate them. Usually Christmas is the time of office parties, but you could do a seasonal one. Showing your appreciation of them will help them stay happy.
5. Give them written reviews of their performance. Pepper the bad with good as well. Have a 1 on 1 meeting with each and go over what you see. Listen to their ideas, their complaints, their praise, and things that you can fix, fix.
Above all, get the most out of your employees by making them do more than just sit there waiting. They will be happier and will help your park's success.