Either the creek or the beach is suitable for canoe launching. During the summer, when the city is hot and muggy, the air still, and the days long, we like to paddle out from shore at Webster Park and watch the sunset. We don't go out if there are waves strong winds, it isn't worth the risk. The best time to go is early evening when the lake winds become calm and the water flat. Even then, it is a good idea to go out with another boat.
Gentle swells are OK, but can lead to seasickness.
Picnicking in the park before or after venturing out on the lake is also enjoyable. If you plan to picnic, bring insect repellent. If you go to the park on a weekend you may not enjoy some of the loud parties picnicking in the park. The often bring professional portable stereos that blast throughout the park. On the other hand, if you are gregarious, try crashing a party or two.