Here are some thoughts:
1. Keep a social distance. Avoid shuttles. If you must, I’ve seen some suggestions to open the windows and wear masks if you’re riding with someone. It’s hard to maintain 6’ of social distance inside a vehicle, and 6’ between moving objects is not sufficient. Florida’s Fish and Wildlife Conservation Commission recommends 50’ between recreational boats.
2. Use loop routes to avoid shuttles.
3. No to groups. Paddle with a trusted friend or two that you’re already exposed to. This time of year, that’s my preference anyway. Most paddles scheduled by organized groups are cancelled.
4. Carry your own boat, or limit who helps you. Being independent is a good thing.
5. Take zero risk. You don’t want to have to involve a rescue group.
6. Don’t advertise. There’s no reason to post on social media which might encourage someone else.
7. Remember to dress for immersion still. Water temperatures are still under 50. See What to Wear When.
8. Realizing that Covid-19 is now thought to spread less by contact and more airborne, it's still wise to clean up afterwards by wiping down your boat and paddle and cleaning exposed clothing. Recommendations for life jackets are to clean following the manufacturers recommendations for cleaning and then let dry in a warm low humidity environment for 72 hours. See http://www.lifejacketassociation.org/life-jackets/covid-19-virus-cleaning-storing-your-pfd/.