There is a lot of difference in water and air temperature between mid spring and summertime.
For mid spring the water could be 10 degrees, and I would be looking at minimum of 4/3mm glued and blindstitched suit, gloves and boots/socks if I was spending any time in the water
For summer a 3/2 overlock seemed suit should be ok
Most of your activities sound like they are above the water rather than in the water so at a push the summer suit might Be bearable, but the air temperature in mid spring could also be low, wind chill is a factor.
It has been about 10 yrs since I bought a wetsuit, they may have moved on and have wider temperature ranges now.